| rod granule | The nucleus of a retinal cell connecting with one of the rods. (05 Mar 2000) |
|---|---|
| rod monochromatism | Achromatopsia with absent colour vision, nystagmus, reduced visual acuity, and light aversion. Synonym: rod monochromatism, typical achromatopsia. (05 Mar 2000) |
| rod myopathy | A congenital myofibrillar abnormality in which small threadlike or rod-shaped bodies are scattered through the muscle fibres. It is marked by hypotonia and proximal muscle weakness. It is also called rod myopathy with reference to the threadlike (greek nema, thread) rods or myofibrils (latin fibrilla, a little fibre or threadlike structure). (12 Dec 1998) |
| rod nuclear cell | <pathology> Immature neutrophils released from the bone marrow reserve in response to acute demand. (18 Nov 1997) |
| rod outer segment | <ophthalmology, physiology> Major photoreceptor cell of vertebrate retina (about 125 million in a human eye). Columnar cells (about 40m long, 1m diameter) having three distinct regions: a region adjacent to and synapsed with, the neural layer of the retina contains the nucleus and other cytoplasmic organelles, below this is the inner segment, rich in mitochondria, that is connected through a thin neck (in which is located a ciliary body) to the outer segment. The outer segment largely consists of a stack of discs membrane infoldings that are incompletely separated in cones) that are continually replenished near the inner segment and that are shed from the distal end and phagocytosed by the pigmented epithelium. The membranes of the discs are rich in rhodopsin, the pigment that absorbs light. (03 Jul 1999) |
| rod outer segments | The portion of the retinal rod cell between the inner segment and the pigment epithelium layer of the retina. (12 Dec 1998) |
| rod vision | Vision when the eye is dark-adapted. See: dark adaptation, dark-adapted eye. Synonym: night vision, rod vision, scotopia, twilight vision. (05 Mar 2000) |
| rodent | 1. <medicine> Gnawing; biting; corroding; applied to a destructive variety of cancer or ulcer. 2. <zoology> Gnawing. Of or pertaining to the Rodentia. Origin: L. Rodens, -entis, p. Pr. Of rodere to gnaw. See Rase, and cf. Rostrum. <zoology> One of the Rodentia. Source: Websters Dictionary (01 Mar 1998) |
| rodent control | The reduction or regulation of the population of noxious, destructive, or dangerous rodents through chemical, biological, or other means. (12 Dec 1998) |
| rodent diseases | Diseases of rodents of the order rodentia. This term includes diseases of sciuridae (squirrels), geomyidae (gophers), heteromyidae (pouched mice), castoridae (beavers), cricetidae (rats and mice), muridae (old world rats and mice), erethizontidae (porcupines), and caviidae (guinea pigs). (12 Dec 1998) |
| rodent ulcer | An obsolete term for a slowly enlarging ulcerated basal cell carcinoma, usually on the face. (05 Mar 2000) |
| rodentia | <zoology> An order of mammals having two (rarely four) large incisor teeth in each jaw, distant from the molar teeth. The rats, squirrels, rabbits, marmots, and beavers belong to this order. The incisor teeth are long, curved, and strongly enameled on the outside, so as to keep a cutting edge. They have a persistent pulp and grow continuously. Origin: NL. See Rodent. Source: Websters Dictionary (01 Mar 1998) |
| rodenticide | <chemistry> Any chemical used to kill rodents (rats, mice, etc.) (17 Dec 1997) |
| rodenticides | Substances used to destroy or inhibit the action of rats, mice, or other rodents. (12 Dec 1998) |
| rodge | <zoology> The gadwall. Source: Websters Dictionary (01 Mar 1998) |
Synonyms : Planing, Root, Planings, Root, Root Planings
Synonyms : Resorption, Root, Resorptions, Root, Root Resorptions
Synonyms :
Synonyms : Test, Rorschach
Synonyms :
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| roseola infantum |
exanthema subitum: a viral disease of infants and young children; characterized by abrupt high fever and mild sore throat; a few days later there is a faint pinkish rash that lasts for a few hours to a few days
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|---|---|
| root cap |
thimble-shaped mass of cells covering and protecting the growing tip of a root
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| rod cell |
rod: visual receptor cell sensitive to dim light
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| rodent |
relatively small gnawing animals having a single pair of constantly growing incisor teeth specialized for gnawing
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| Robbins |
United States choreographer who brought human emotion to classical ballet and spirited reality to Broadway musicals (1918-1998)
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| RO | cut of beef suitable for roasting |
|---|---|
| RO | iris with purple flowers and evil-smelling leaves |
| RO | a cut of lamb suitable for roasting |
| RO | cut of pork suitable for roasting |
| RO | cut of veal suitable for roasting |
| RO | (of meat) cooked by dry heat in an oven |
| RO | a special cooking pan for roasting |
| RO | flesh of a large young chicken over 3 1/2 lb suitable for roasting |
| RO | a cook who roasts food |
| RO | a harsh or humorous critic (sometimes intended as a facetious compliment) |
| RO | cooking (meat) by dry heat in an oven (usually with fat added) |
| RO | rip off |
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