| opsin | <protein> General term for the apoproteins of the rhodopsin family. (18 Nov 1997) |
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| opsinogen | A substance that stimulates the formation of opsonin, such as the antigen contained in a suspension of bacteria used for immunization. Synonym: opsogen. Origin: opsonin + -gen (05 Mar 2000) |
| opsiometer | An instrument for measuring the limits of distincts vision in different individuals, and thus determiming the proper focal length of a lens for correcting imperfect sight. Origin: Gr. Sight: cf. F. Opsiometre. Source: Websters Dictionary (01 Mar 1998) |
| opsiuria | A more rapid excretion of urine during fasting than after a full meal. Origin: G. Opsi, late, + ouron, urine (05 Mar 2000) |