English dictionary of medical terms (60)
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- No:1180 - nutrient
(L. nutriens) 1. nourishing, affording nutriment. 2. a nutritious
substance; food, or a component of food.
- No:1181 - nystagmus
(Gr. nystagmos drowsiness, from nystazein to nod) an involuntary,
rapid, rhythmic movement of the eyeball, which may be horizontal,
vertical, rotatory, or mixed, i.e., of two varieties.
- No:1182 - obesity
(L. obesus fat) an increase in body weight beyond the limitation of
skeletal and physical requirement, as the result of an excessive
accumulation of fat in the body.
- No:1183 - objective
(L. objectivus) 1. perceptible to the external senses. 2. the lens
or system of lenses in a microscope (or telescope) that is nearest
to the object under examination.
- No:1184 - observation
an act or the faculty of observing or taking notice : an act of
seeing or fixing the mind upon something; an act of recognizing and
noting measurement of some magnitude with suitable instruments.
- No:1185 - obsession
(L. obsessio) a recurrent, persistent thought, image, or impulse
that is unwanted and distressing (ego-dystonic) and comes
involuntarily to mind despite attempts to ignore or suppress it.
Common obsessions involve thoughts of violence, contamination, and
- No:1186 - obstetric, obstetrical
(L. obstetricius) pertaining to obstetrics (= branch of surgery
that deals with pregnancy, labour and puerperium.
- No:1187 - obstipation
(L. obstipatio) intractable constipation.
- No:1188 - obstruction
(L. obstructio) 1. the act of blocking or clogging. 2. the state
or condition of being clogged.
- No:1189 - occasional
appearing or occurring irregularly and according to no fixed or
- No:1190 - occlusion
(L. occlusio) 1. the act of closure or state of being closed. 2.
the relationship between all of the components of the masticatory
system in normal function, dysfunction, and parafunction. 3.
momentary complete closure of some area in the vocal tract, causing
stoppage of the breath and accumulation of pressure.
- No:1191 - occult
obscure; concealed from observation, difficult to understand.
- No:1192 - ocular
(L. ocularis, from oculus eye) 1. of, pertaining to, or affecting
the eye. 2. eyepiece.
- No:1193 - oculogyric
pertaining to, characterized by, or causing oculogyration (circular
movements of the eyeballs, as in an oculogyric crisis).
- No:1194 - oculomucocutaneous
pertaining to or affecting the mucous membrane and the skin around
- No:1195 - odour
a volatile emanation that is perceived by the sense of smell.
- No:1196 - oedema
(Gr. oidema swelling) the presence of abnormally large amounts of
fluid in the intercellular tissue spaces of the body; usually
applied to demonstrable accumulation of excessive fluid in the
subcutaneous tissues. Edema may be localized, due to venous or
lymphatic obstruction or to increased vascular permeability, or it
may be systemic due to heart failure or renal disease. Collections
of edema fluid are designated according to the site, e.g. ascites
(peritoneal cavity), hydrothorax (pleural cavity), and
hydropericardium (pericardial sac). Massive generalized edema is
- No:1197 - oesophagitis
(esophagus + -itis) inflammation of the esophagus.
- No:1198 - oestrogen
a generic term for oestrus-producing steroid compounds; the female
sex hormones. In humans, oestrogen is formed in the ovary,
possibly the adrenal cortex, the testis, and the foetoplacental
unit; it has various functions in both sexes. It is responsible
for the development of the female secondary sex characteristics,
and during the menstrual cycle it acts on the female genitalia to
produce an environment suitable for the fertilization,
implantation, and nutrition of the early embryo. Oestrogen is used
in oral contraceptives and as a palliative in cancer of the breast
after menopause and cancer of the prostate; other uses include the
relief of the discomforts of menopause, inhibition of lactation,
and treatment of osteoporosis, threatened abortion, and various
functional ovarian disorders.
- No:1199 - oligoelement
a chemical substance, minute amounts of which can be found in
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