| orthopoda | <paleontology> An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts. Origin: NL. See Ortho-, and -poda. Source: Websters Dictionary (01 Mar 1998) |
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| Orthopoxviridae | <organism, virology> Genus of double stranded DNA viruses (250-390 x 200-260nm) that preferentially infect epithelial cells. Includes variola (smallpox) and vaccinia. (18 Nov 1997) |
| orthopoxvirus | A genus of the family poxviridae, subfamily chordopoxvirninae, comprising many species infecting mammals. Viruses of this genus cause generalised infections and a rash in some hosts. The type species is vaccinia virus. (12 Dec 1998) |
| orthopraxy | <medicine> The treatment of deformities in the human body by mechanical appliances. Origin: Gr. Straight + a doing. Source: Websters Dictionary (01 Mar 1998) |
| orthoprosthesis | An appliance used in the management of prosthetic problems related to alignment of teeth. (05 Mar 2000) |
| orthopsychiatry | The study and treatment of human behaviour problems utilizing principles derived from the behavioural, medical, and social science with emphasis on promotion of mental health. (12 Dec 1998) |
| orthoptera | <zoology> An order of mandibulate insects including grasshoppers, locusts, cockroaches, etc. The anterior wings are usually thickened and protect the posterior wings, which are larger and fold longitudinally like a fan. The Orthoptera undergo no metamorphosis. Origin: NL, fr. Gr. Straight + feather, wing. Source: Websters Dictionary (01 Mar 1998) |
| orthopteran | <zoology> One of the Orthoptera. Source: Websters Dictionary (01 Mar 1998) |
| orthopterous | <zoology> Of or pertaining to the Orthoptera. Source: Websters Dictionary (01 Mar 1998) |
| orthoptic | Relating to orthoptics. (05 Mar 2000) |
| orthoptics | The study and treatment of defects in binocular vision resulting from defects in the optic musculature or of faulty visual habits. It involves a technique of eye exercises designed to correct the visual axes of eyes not properly coordinated for binocular vision. (12 Dec 1998) |
| orthoptist | One skilled in orthoptics. (05 Mar 2000) |
| orthoreovirus | A genus of the family reoviridae infecting vertebrates only. Transmission is horizontal and infected species include humans, birds, cattle, monkeys, sheep, swine, and bats. Reovirus 1, reovirus 2, and reovirus 3 infect mammals. Reovirus 1 is the type species. (12 Dec 1998) |
| orthorhombic | <chemistry> Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization. Origin: Ortho- + rhombic. Source: Websters Dictionary (01 Mar 1998) |
| orthoscope | <instrument, physics> An instrument designed to show the condition of the superficial portions of the eye. Origin: Ortho- + -scope. Source: Websters Dictionary (01 Mar 1998) |