| symmetric distal neuropathy | <neurology> A disease process involving a number of peripheral nerves. Origin: Gr. Pathos = disease (14 Oct 1997) |
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| symmetric disulfide | Disulfide that is symmetric on both sides of the -s-s- linkage; i.e., disulfide formed from identical thiol-containing compounds; e.g., cystine, glutathione disulfide. (05 Mar 2000) |
| symmetrical | 1. Involving or exhibiting symmetry; proportional in parts; having its parts in due proportion as to dimensions; as, a symmetrical body or building. 2. <biology> Having the organs or parts of one side correspponding with those of the other; having the parts in two or more series of organs the same in number; exhibiting a symmetry.See Symmetry. 3. <botany> Having an equal number of parts in the successive circles of floral organs; said of flowers. Having a likeness in the form and size of floral organs of the same kind; regular. 4. <mathematics> Having a common measure; commensurable. Having corresponding parts or relations. A curve or a plane figure is symmetrical with respect to a given line, and a line, surface, or solid with respect to a plane, when for each point on one side of the line or plane there is a corresponding point on the other side, so situated that the line joining the two corresponding points is perpendicular to the line or plane and is bisectad by it. Two solids are symmetrical when they are so situate dwith the respect to an intervening plane that the several points of their surfaces thus correspond to each other in position and distance. In analysis, an expression is symmetrical with respect to several letters when any two of them may change places without affecting the expression; as, the expression a^2b + ab^2 + a^2c + ac^2 + b^2c + bc^2, is symmetrical with respect to the letters a, b, c. Symmet"rically, Symmet"ricalness. Origin: Cf. F. Symetrique. See Symmetry. Source: Websters Dictionary (01 Mar 1998) |
| symmetrical gangrene | Gangrene affecting the extremities of both sides of the body; it is seen particularly in severe arteriosclerosis, myocardial infarction, and ball-valve thrombus. (05 Mar 2000) |
| symmetry | 1. A due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole. 2. <biology> The law of likeness; similarity of structure; regularity in form and arrangement; orderly and similar distribution of parts, such that an animal may be divided into parts which are structurally symmetrical. Bilateral symmetry, or two-sidedness, in vertebrates, etc, is that in which the body can be divided into symmetrical halves by a vertical plane passing through the middle; radial symmetry, as in echinoderms, is that in which the individual parts are arranged symmetrically around a central axis; serial symmetry, or zonal symmetry, as in earthworms, is that in which the segments or metameres of the body are disposed in a zonal manner one after the other in a longitudinal axis. This last is sometimes called metamerism. 3. <botany> Equality in the number of parts of the successive circles in a flower. Likeness in the form and size of floral organs of the same kind; regularity. Axis of symmetry. <geometry> See Axis. Respective symmetry, that disposition of parts in which only the opposite sides are equal to each other. Origin: L. Symmetria, Gr.; with, together + a measure: cf. F. Symetrie. See Syn-, and Meter rhythm. Source: Websters Dictionary (01 Mar 1998) |
| symmetry axis | <radiobiology> The straight line (usually vertical) through the centre of a configuration, when the configuration is symmetric to all (axisymmetric, like the tokamak) or some (periodic, like the stellarator) rotations about this line. Usually the z-axis. (09 Oct 1997) |
| sympath- | Sympatheto-sympathico-sympatho- The sympathetic part of the autonomic nervous system. Origin: see sympathetic (05 Mar 2000) |
| sympathectomy | <procedure, surgery> Excision of a sympathetic nerve. Occasionally used for the treatment of reflex sympathetic dystrophy. (27 Sep 1997) |
| sympathectomy, chemical | Sympathectomy using chemicals (e.g., 6-hydroxydopamine or guanethidine) which selectively and reversibly destroy adrenergic nerve endings while leaving cholinergic nerve endings intact. (12 Dec 1998) |
| sympathetectomy | <procedure, surgery> Excision of a sympathetic nerve. Occasionally used for the treatment of reflex sympathetic dystrophy. (27 Sep 1997) |
| sympathetic | 1. <psychology> Pertaining to, caused by or exhibiting sympathy. 2. <physiology> A sympathetic nerve or the sympathetic nervous system. Origin: Gr. Sympathetikos (19 Jan 1998) |
| sympathetic agent | An agent that evokes responses similar to those produced by adrenergic nerve activity (e.g., epinephrine, ephedrine, isoproterenol). Synonym: adrenergic amine, adrenomimetic amine, sympathetic amine. (05 Mar 2000) |
| sympathetic amine | An agent that evokes responses similar to those produced by adrenergic nerve activity (e.g., epinephrine, ephedrine, isoproterenol). Synonym: adrenergic amine, adrenomimetic amine, sympathetic amine. (05 Mar 2000) |
| sympathetic blockade | Interruption of transmission in sympathetic ganglia or conduction of impulses in pre-or postganglionic sympathetic nerve fibres. (05 Mar 2000) |
| sympathetic branch to submandibular ganglion | Branch to the submandibular ganglion composed of postsynaptic sympathetic fibres from the internal carotid plexus conveyed largely by a periarterial plexus of the facial artery. Synonym: ramus sympathicus [sympatheticus] ad ganglion submandibulare. (05 Mar 2000) |
Synonyms : Co Transporters
| sympathetic nervous system |
originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels
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| sympathomimetic |
adrenergic: relating to epinephrine (its release or action)
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| sympathy |
an inclination to support or be loyal to or to agree with an opinion; "his sympathies were always with the underdog"; "I knew I could count on his understanding" sharing the feelings of others (especially feelings of sorrow or anguish) a relation of affinity or harmony between people; whatever affects one correspondingly affects the other; "the two of them were in close sympathy"
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| symphysion |
the most forward point of the alveolar process of the mandible
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| symphysis |
an abnormal adhesion of two or more structures a growing together of parts or structures
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| sym | the practice of investing things with symbolic meaning |
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| sym | a system of symbols and symbolic representations |
| sym | a member of an artistic movement that expressed ideas indirectly via symbols |
| sym | someone skilled in the interpretation or representation of symbols |
| sym | the practice of investing things with symbolic meaning |
| sym | something visible that by association or convention represents something else that is invisible |
| sym | the use of symbols to convey meaning |
| sym | express indirectly by an image, form, or model |
| sym | represent or identify by using a symbol |
| sym | someone skilled in the interpretation or representation of symbols |
| sym | the act of representing something with a symbol |
| sym | worship of symbols |