| parallel attachment | A frictional or mechanically retained unit used in fixed or removable prosthodontics, consisting of closely fitting male and female parts, an attachment that may be rigid in function or may incorporate a movable stress control unit to reduce the torque on the abutment. Synonym: frictional attachment, internal attachment, key attachment, keyway attachment, parallel attachment, slotted attachment. (05 Mar 2000) |
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| radiographic parallel line shadows | The images of bronchial walls, usually thickened; colloq., British. Synonym: radiographic parallel line shadows. (05 Mar 2000) |
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| parallel | 1. Pertaining to straight lines or planes that do not intersect. 2. <physics> Pertaining to electric circuit components connected in parallel so that the current flow divides, each branch passing through one component and rejoins, applied by extension to any similar parallel circuit, for example the systemic circulation to the various organs. (18 Nov 1997) |
| Parallel Electron Energy Loss Spectroscopy | <technique> Electron energy loss spectroscopy analyses the inelastically scattered electrons present in the beam after it has been transmitted through the sample. An electron energy loss spectrum typically consists of a monatomic decreasing background on which are superimposed a number of peaks. Each peak is characteristic of the scattering process that has occurred in the sample. The peaks can be used to obtain information about the chemical composition and electronic structure of the sample. Electron energy loss spectra are acquired typically in a magnetic sector spectrometer located under the camera chamber of the transmission electron microscope. Spatial resolution is typically limited by the minimum probe diameter of the microscope. Electron energy loss spectroscopy tends to be complimentary to EDS in that it can be used to analyse very thin samples of low Z materials. Acronym: PEELS (05 Aug 1998) |
| parallel rays | Ray's parallel to the axis of an optical system. (05 Mar 2000) |
| parallel track | <pharmacology> A system for distributing certain experimental drugs to people who are unable to participate in ongoing clinical trials. (09 Oct 1997) |
| plane-parallel | <optics> Having opposite surfaces exactly plane and parallel, as a piece of glass. Source: Websters Dictionary (01 Mar 1998) |
| second parallel pelvic plane | The plane extending from the middle of the posterior surface of the pubic symphysis to the junction of the second and third sacral vertebrae, and laterally passing through the ischial bones over the middle of the acetabulum. Synonym: second parallel pelvic plane, wide plane. (05 Mar 2000) |
| third parallel pelvic plane | The plane that extends from the end of the sacrum to the inferior border of the pubic symphysis; it is bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the inferior border of the pubic symphysis. Synonym: midplane, plane of least pelvic dimensions, plane of midpelvis, third parallel pelvic plane. (05 Mar 2000) |
| extinction parallel | <microscopy> Vibration directions parallel and perpendicular to the long direction of the crystal or fibre. (05 Aug 1998) |
| first parallel pelvic plane | The upper opening of the true pelvis, bounded anteriorly by the pubic symphysis and the pubic crest on either side, laterally by the iliopectineal lines, and posteriorly by the promontory of the sacrum. Synonym: apertura pelvis superior, aditus pelvis, first parallel pelvic plane, pelvic brim, pelvic inlet, pelvic plane of inlet, plane of inlet. (05 Mar 2000) |
| fourth parallel pelvic plane | The lower opening of the true pelvis, bounded anteriorly by the pubic arch, laterally by the rami of the ischium and the sacrotuberous ligament on either side, and posteriorly by these ligaments and the tip of the coccyx. Synonym: apertura pelvis inferior, apertura pelvis minoris, fourth parallel pelvic plane, pelvic outlet, pelvic plane of outlet, plane of outlet. (05 Mar 2000) |
| attachment | 1. The act attaching, or state of being attached; close adherence or affection; fidelity; regard; an passion of affection that binds a person; as, an attachment to a friend, or to a party. 2. That by which one thing is attached to another; connection; as, to cut the attachments of a muscle. "The human mind . . . Has exhausted its forces in the endeavor to rend the supernatural from its attachment to this history." (I. Taylor) 3. Something attached; some adjunct attached to an instrument, machine, or other object; as, a sewing machine attachment (i. E, a device attached to a sewing machine to enable it to do special work, as tucking, etc). 4. A seizure or taking into custody by virtue of a legal process. The writ or percept commanding such seizure or taking. The term is applied to a seizure or taking either of persons or property. In the serving of process in a civil suit, it is most generally applied to the taking of property, whether at common law, as a species of distress, to compel defendant's appearance, or under local statutes, to satisfy the judgment the plaintiff may recover in the action. The terms attachment and arrest are both applied to the taking or apprehension of a defendant to compel an appearance in a civil action. Attachments are issued at common law and in chancery, against persons for contempt of court. In England, attachment is employed in some cases where capias is with us, as against a witness who fails to appear on summons. In some of the new England States a writ of attachment is a species of mesne process upon which the property of a defendant may be seized at the commencement of a suit and before summons to him, and may be held to satisfy the judgment the plaintiff may recover. In other States this writ can issue only against absconding debtors and those who conceal themselves. See Foreign, Garnishment, Trustee process. Synonym: Attachment, Affection The leading idea of affection is that of warmth and tenderness; the leading idea of attachment is that of being bound to some object by strong and lasting ties. There is more of sentiment (and sometimes of romance) in affection, and more of principle in preserving attachment. We speak of the ardor of the one, and the fidelity of the other. There is another distinction in the use and application of these words. The term attachment is applied to a wider range of objects than affection. A man may have a strong attachment to his country, to his profession, to his principles, and even to favorite places; in respect to none of these could we use the word affection. Origin: F. Attachment. Source: Websters Dictionary (01 Mar 1998) |
| attachment apparatus | The tissues that attach the tooth to the alveolar process: cementum, periodontal membrane, and alveolar bone. (05 Mar 2000) |
| attachment sites | <microbiology, molecular biology> Particular loci in both bacterial and phage DNA molecules at which phage DNA is integrated into the bacterial DNA by recombination between these sites. (12 Dec 1998) |
| reactive attachment disorder | Markedly disturbed and developmentally inappropriate social relatedness that begins before age 5 and is associated with grossly pathological child care. The child may persistently fail to initiate and respond to social interactions in a developmentally appropriate way (inhibited type) or there may be a pattern of diffuse attachments with nondiscriminate sociability (disinhibited type). (12 Dec 1998) |