| opisthenar | Dorsum of the hand. Origin: G. Back of the hand, from opisthen, behind, + thenar, palm of the hand (05 Mar 2000) |
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| opisthiobasial | Relating to both opisthion and basion; denoting a line connecting the two, or the distance between them. (05 Mar 2000) |
| opisthion | <anatomy> The middle of the posterior, or dorsal, margin of the great foramen of the skull. Origin: NL, fr. Gr. Hinder. Source: Websters Dictionary (01 Mar 1998) |
| opisthionasial | Relating to the opisthion and the nasion; denoting the distance between the two points. (05 Mar 2000) |
| opistho- | Backward, behind, dorsal. Origin: G. Opisthen, at the rear, behind (05 Mar 2000) |
| opisthobranchiata | <zoology> A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs. Origin: NL, from Gr. Behind + gills. Source: Websters Dictionary (01 Mar 1998) |
| opisthobranchiate | <zoology> Of or pertaining to the Opisthobranchiata. One of the Opisthobranchiata. Source: Websters Dictionary (01 Mar 1998) |
| opisthocheilia | Opisthochilia Recession of the lips. Origin: opistho-+ G. Cheilos, lip (05 Mar 2000) |
| opisthocoelous | <anatomy> Concave behind; applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concave. Origin: Gr. Behind + hollow. Source: Websters Dictionary (01 Mar 1998) |
| opisthoglypha | <zoology> A division of serpents which have some of the posterior maxillary teeth grooved for fangs. Origin: NL, from Gr. Behind + to carve. Source: Websters Dictionary (01 Mar 1998) |
| opisthography | A writing upon the back of anything, as upon the back of a leaf or sheet already written upon on one side. Origin: Gr. Behind. Source: Websters Dictionary (01 Mar 1998) |
| opisthomastigote | Term now used instead of herpetomonad for the stage of development of certain insect and plant parasitizing flagellates to avoid confusion between the stage and the genus Herpetomonas. In this stage the flagellum arises from the kinetoplast located behind the nucleus and emerges from the anterior end of the organism; an undulating membrane is absent. Origin: opistho-+ G. Mastix, whip (05 Mar 2000) |
| opisthomi | <zoology> An order of eellike fishes having the scapular arch attached to the vertebrae, but not connected with the skull. Origin: NL, fr. Gr. Behind + the shoulder. Source: Websters Dictionary (01 Mar 1998) |
| opisthoporeia | Involuntary backward gait; frequently connected with parkinsonism. Origin: opistho-+ G. Poreia, a walking, fr. Poreuo, to go, walk (05 Mar 2000) |
| opisthopulmonate | <zoology> Having the pulmonary sac situated posteriorly; said of certain air-breathing Mollusca. Origin: Gr. Behind + E. Pulmonate. Source: Websters Dictionary (01 Mar 1998) |