Orienting reflex



orienting reflex n.
An aspect of responding to environmental stimuli attending in which an organism’s initial response to a change or novel stimulus makes the organism more sensitive to the stimulation, as when the pupil of the eye dilates in response to dim light. Also called orienting response.

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  • Orienting response

    orienting response n. See orienting reflex.

  • Orif

    open reduction internal fixation



  • Orifice

    [awr-uh-fis, or-] /ˈɔr ə fɪs, ˈɒr-/ noun 1. an opening or aperture, as of a tube or pipe; a mouthlike opening or hole; mouth; vent. /ˈɒrɪfɪs/ noun 1. (mainly Technical) an opening or mouth into a cavity; vent; aperture n. early 15c., from Middle French orifice “the opening of a wound” (14c.) and directly from […]

  • Orifices

    [awr-uh-fis, or-] /ˈɔr ə fɪs, ˈɒr-/ noun 1. an opening or aperture, as of a tube or pipe; a mouthlike opening or hole; mouth; vent. /ˈɒrɪfɪs/ noun 1. (mainly Technical) an opening or mouth into a cavity; vent; aperture n. early 15c., from Middle French orifice “the opening of a wound” (14c.) and directly from […]



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