phoro-optometer pho·ro-op·tom·e·ter (fôr’ō-ŏp-tŏm’ĭ-tər)
An instrument for determining phorias, ductions, and refractive states of the eyes.
phoropter pho·rop·ter (fə-rŏp’tər) n. A device containing different lenses used for refraction of the eye during sight testing.
phos- pref. Light: phosgene.
[fos-jeen, foz-] /ˈfɒs dʒin, ˈfɒz-/ noun, Chemistry. 1. a poisonous, colorless, very volatile liquid or suffocating gas, COCl 2 , a chemical-warfare compound: used chiefly in organic synthesis. /ˈfɒzdʒiːn/ noun 1. a colourless easily liquefied poisonous gas, carbonyl chloride, with an odour resembling that of new-mown hay: used in chemical warfare as a lethal choking […]
[fos-juh-nahyt, foz-] /ˈfɒs dʒəˌnaɪt, ˈfɒz-/ noun 1. a mineral, lead chlorocarbonate, Pb 2 Cl 2 CO 3 , occurring in crystals. /ˈfɒzdʒɪˌnaɪt/ noun 1. a rare fluorescent secondary mineral consisting of lead chloro-carbonate in the form of greyish tetragonal crystals. Formula: Pb2(Cl2CO3)