| OAS | old age security; oral allergy syndrome; osmotically active substance |
|---|---|
| OAW | oral airways |
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
| OCC | object-centered coordinate [method]; oral cholecystography |
| water deer | <zoology> A small Chinese deer (Hydropotes inermis). Both sexes are destitute of antlers, but the male has large, descending canine tusks. The water chevrotain. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| water deprivation | The withholding of water in a structured experimental situation. (12 Dec 1998) |
| water devil | <zoology> The rapacious larva of a large water beetle (Hydrophilus piceus), and of other similar species. Source: Websters Dictionary (01 Mar 1998) |
| water diuresis | Diuresis following the drinking of water; due to reduced secretion of the antidiuretic hormone of the neurohypophysis in response to the lowered osmotic pressure of the blood. (05 Mar 2000) |
| water dock | <botany> A tall, coarse dock growing in wet places. The American water dock is Rumex orbiculatus, the European is R. Hydrolapathum. Source: Websters Dictionary (01 Mar 1998) |
| water doctor | <medicine> One who professes to be able to divine diseases by inspection of the urine. A physician who treats diseases with water; an hydropathist. Source: Websters Dictionary (01 Mar 1998) |
| water dog | 1. <zoology> A dog accustomed to the water, or trained to retrieve waterfowl. Retrievers, waters spaniels, and Newfoundland dogs are so trained. 2. <zoology> The menobranchus. 3. A small floating cloud, supposed to indicate rain. 4. A sailor, especially. An old sailor; an old salt. Source: Websters Dictionary (01 Mar 1998) |
| water dressing | <medicine> The treatment of wounds or ulcers by the application of water; also, a dressing saturated with water only, for application to a wound or an ulcer. Source: Websters Dictionary (01 Mar 1998) |
| water-drinking test | A test of the assessment of open-angle glaucoma, measuring intraocular pressure after drinking a quart of water in five minutes. (05 Mar 2000) |
| water dropwort | <botany> A European poisonous umbelliferous plant (Enanthe fistulosa) with large hollow stems and finely divided leaves. Source: Websters Dictionary (01 Mar 1998) |
| water eagle | <zoology> The osprey. Source: Websters Dictionary (01 Mar 1998) |
| water elder | <botany> The guelder-rose. Source: Websters Dictionary (01 Mar 1998) |
| water-electrolyte balance | The state of the body in relation to the intake and excretion of water and electrolytes, particularly sodium and potassium. It exists in a metabolic balance internally with body fluid compartments, total body water, blood volume, extracellular space, etc., externally through sensible and insensible sweating. The hypothalamus controls water balance. (12 Dec 1998) |
| water-electrolyte imbalance | Disturbances in the body's water-electrolyte metabolism. (12 Dec 1998) |
| water elephant | <zoology> The hippopotamus. Source: Websters Dictionary (01 Mar 1998) |