Miosis
WordNet
noun
(1) Reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
(2) (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)
WiktionaryText
Noun
- Contraction of the pupil of the eye.
- Horner's syndrome consists of miosis, eyelid ptosis and absent forehead sweating.