Link Centre Dictionary

ptosis

pto·sis

UK/ˈtəʊ.sɪs/ US/ˈtoʊ.sɪs/ uncommon

noun

1.

drooping of the upper eyelid caused by muscle paralysis and weakness

Origin

From Ancient Greek πτῶσις (ptôsis, “falling, fall”), from πίπτω (píptō, “to fall down”) + -σις (-sis, nominal suffix). First used in 1710.

Related words

Broader terms

Narrower terms

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.