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).
See Puppet, and cf. Pupil of the eye. (Science: anatomy) The aperture in the iris; the sight, apple, or black of the eye. See the note under Eye, and iris. (Science: medicine) pin-hole pupil, the pupil of the eye when so contracted (as it sometimes is in typhus, or opium poisoning) as to resemble a pin hole.Origin: F. Pupille, n. Fem, L. Pupilla the pupil of the eye, originally dim. Of pupa a girl.ee Puppet, and cf. Pupil of the eye. (Science: anatomy) The aperture in the iris; the sight, apple, or black of the eye. See the note under Eye, and iris. (Science: medicine) pin-hole pupil, the pupil of the eye when so contracted (as it sometimes is in typhus, or opium poisoning) as to resemble a pin hole.