/ Dictionary / Index S semicrystalline: Meaning and Definition of Find definitions for: sem•i•crys•tal•line Pronunciation: (sem"ē-kris'tl-in, -īn", sem"ī-), [key] — adj. partly or imperfectly crystalline. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. semiconscious semicylinder Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language