"contraction of the pupil of the eye," 1819, from Greek myein "to shut (the eyes)" + -osis. Greek myein is perhaps originally "to close the lips," from PIE *meue- "to be silent" (see mute (adj.)). Related: Miotic.
word-forming element expressing state or condition, in medical terminology denoting "a state of disease," from Latin -osis and directly from Greek -osis, formed from the aorist of verbs ending in -o. It corresponds to Latin -atio.
late 14c., mewet "silent, not speaking," from Old French muet "dumb, mute" (12c.), diminutive of mut, mo, from Latin mutus "silent, speechless, dumb," probably from imitative base *meue- (source also of Sanskrit mukah "dumb," Greek myein "to be shut," of the mouth). Form assimilated in 16c. to Latin mutus. The meaning "incapable of utterance, dumb" is by mid-15c.
<a href="https://www.etymonline.com/word/miosis">Etymology of miosis by etymonline</a>
Harper, D. (n.d.). Etymology of miosis. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/miosis
D. Harper. “Etymology of miosis.” Online Etymology Dictionary. https://www.etymonline.com/word/miosis (accessed $(datetime)).
Definitions of miosis
(genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants);