'Proemptosis' definitions:

Definition of 'Proemptosis'

From: GCIDE

Proemptosis \Pro`emp*to"sis\, n. [NL., from Gr. ? to fall in before; ? before + ? in + ? to fall.] (Chron.) The addition of a day to the lunar calendar. [R.] See Metemptosis. [1913 Webster]