ptosis noun. ['tǝʊsɪs] Pl. ptoses ['tǝʊsi:z]. M18.
[Greek ptōsis falling, fall.]
Medicine. Prolapse of an organ; spec. drooping of the upper eyelid, usu. from a disorder of the levator muscle or its nerve supply.

■ ptotic ['tǝʊtɪk] adjective pertaining to or affected with ptosis L19.

[TahlilGaran] English Dictionary ▲