/ Dictionary / Index S semiellipse: Meaning and Definition of Find definitions for: sem•i•el•lipse Pronunciation: (sem"ē-i-lips', sem"ī-), [key] — n. Geom. a half ellipse, usually one containing both ends of the major axis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. semidurables semievergreen Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language