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1650s, from Greek opsimathia “learning late in life,” from opse “late” (related to opiso “backward,” opisthen “behind”) + manthanein “to learn” (see mathematic). Related: Opsimath (n.).


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  • Opsin

    [op-sin] /ˈɒp sɪn/ noun, Biochemistry. 1. any of several compounds that form the protein component of the light-sensitive retina pigment, rhodopsin. /ˈɒpsɪn/ noun 1. the protein that together with retinene makes up the purple visual pigment rhodopsin opsin op·sin (ŏp’sĭn) n. A protein of the retina, especially the protein constituent of rhodopsin, that makes up […]

  • Opsiuria

    opsiuria op·si·u·ri·a (ŏp’sĭ-yur’ē-ə) n. A more rapid excretion of urine during fasting than after a full meal.

  • Opsinogen

    opsinogen op·sin·o·gen (ŏp-sĭn’ə-jən, -jěn’) n. A substance that stimulates the formation of opsonin. Also called opsogen.

  • Opsoclonus

    opsoclonus op·so·clo·nus (ŏp’sō-klō’nəs) n. Rapid, irregular, nonrhythmic movements of the eye in horizontal and vertical directions.

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