Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol. It occurs in yeast and bacteria, and also in oxygen-starved muscle cells, as in the case of lactic acid fermentation.
pupil noun [C] (EYE PART). âº the âcircular âblack âarea in the âcentre of an âeye, through which âlight âenters: Pupils âcontract in âbright âlight, and âdilate in darkness. (Definition of pupil from the Cambridge Advanced Learners Dictionary & Thesaurus Â© Cambridge University Press).
Best Answer: The pupil is the black part in your eye. If it is dilated, it is bigger than usual. The pupils usually constrict (get smaller) when you shine light into it, and they dilate (get bigger) when it is dark. You can check this by looking into a mirror and than shining a light at your eyes.