| opisthotonic | Relating to or characterised by opisthotonos. (05 Mar 2000) |
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| opisthotonoid | Resembling opisthotonos. (05 Mar 2000) |
| opisthotonos | <neurology> A form of spasm in which the head and the heels are bent backward and the body bowed forward. Origin: Gr. Tonos = tension (18 Nov 1997) |
| opisthotonus | Spasm of the body where the head and heels are bent backward and the body is bowed forward. A type of extrapyramidal effect. (27 Sep 1997) |
| Opitz | John M., U.S. Paediatrician, *1935. See: Smith-Lemli-Opitz syndrome. (05 Mar 2000) |
| opium | <chemistry> The inspissated juice of the Papaver somniferum, or white poppy. Opium is obtained from incisions made in the capsules of the plant, and the best flows from the first incision. It is imported into Europe and America chiefly from the Levant, and large quantities are sent to China from India, Persia, and other countries. It is of a brownish yellow colour, has a faint smell, and bitter and acrid taste. It is a stimulant narcotic poison, which may produce hallicinations, profound sleep, or death. It is much used in medicine to soothe pain and inflammation, and is smoked as an intoxicant with baneful effects. Opium joint, a low resort of opium smokers. Origin: L, fr. Gr. Poppy juice, dim. Of vegetable juice. Source: Websters Dictionary (01 Mar 1998) |
| ople tree | The witch-hazel. Origin: L. Opulus a kind of maple tree. Source: Websters Dictionary (01 Mar 1998) |
| opo- | 1. The face; an eye. See: fascio-. 2. Juice, balm. Origin: G. Ops (05 Mar 2000) |
| opobalsamum | <medicine> The old name of the aromatic resinous juice of the Balsamodendron opobalsamum, now commonly called balm of Gilead. See Balm. Origin: L. Opobalsamum, Gr.; vegetable juice + balsam. Source: Websters Dictionary (01 Mar 1998) |
| opodidymus | Conjoined twins with a single body having two heads fused at the back with partially separated facial regions. See: conjoined twins. Origin: G. Ops, eye, face, + didymos, twin (05 Mar 2000) |
| opopanax | The inspissated juice of an umbelliferous plant (the Opoponax Chironum), brought from Turkey and the East Indies in loose granules, or sometimes in larger masses, of a reddish yellow colour, with specks of white. It has a strong smell and acrid taste, and was formerly used in medicine as an emmenagogue and antispasmodic. Origin: L, fr. Gr.; vegetable juice +, . A kind of plant: cf. F. Opopanax. Source: Websters Dictionary (01 Mar 1998) |
| opossum | <zoology> Any American marsupial of the genera Didelphys and Chironectes. The common species of the United States is Didelphys Virginiana. Several related species are found in South America. The water opossum of Brazil (Chironectes variegatus), which has the hind feet, webbed, is provided with a marsupial pouch and with cheek pouches. It is called also yapock. Opossum mouse. <zoology> Any schizopod crustacean of the genus Mysis and allied genera. See Schizopoda. Origin: Of N. American Indian origin. Source: Websters Dictionary (01 Mar 1998) |
| opossum encephalitis | Encephalitis of opossum caused by Chlamydia psittaci. (05 Mar 2000) |
| opossums | Marsupials of the family didelphidae. Opossums are common, omnivorous, largely nocturnal and arboreal mammals, grow to about three feet in length, including the scaly prehensile tail, have coarse grayish fur mingled with whitish hairs, and have an abdominal pouch in which the young are carried at birth. (webster, 3d ed) (12 Dec 1998) |
| Oppenheim's disease | Atonic pseudoparalysis of congenital origin (neither familial nor hereditary), observed especially in infants and characterised by absences of muscular tone only in muscles innervated by the spinal nerves. Synonym: congenital atonic pseudoparalysis, myatonia congenita, Oppenheim's disease, Oppenheim's syndrome. An indefinite term for a number of congenital neuromuscular disorders that cause generalised myotonia in young children, and that have a benign course (static or regressive). (05 Mar 2000) |
| ophiasis |
(ophi
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| opticofacial winking reflex |
closure of the lids when an object is brought suddenly into the field of vision.
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| ophryon |
(oph
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| ophryosis |
(oph
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| ophthalmagra |
(oph
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| OP | having influence or producing an effect |
|---|---|
| OP | conditioning in which an operant response is brought under stimulus control by virtue of presenting reinforcement contingent upon the occurrence of the operant response |
| OP | perform surgery on |
| OP | happen |
| OP | perform a movement in military or naval tactics in order to secure an advantage in attack or defense |
| OP | handle and cause to function |
| OP | keep engaged |
| OP | perform as expected when applied |
| OP | direct or control |
| OP | perform surgery on |
| OP | of or relating to or characteristic of opera |
| OP | singer of lead role in an opera |