/ Dictionary / Index M mezlocillin: Meaning and Definition of Find definitions for: mez•lo•cil•lin Pronunciation: (mez"lu-sil'in), [key] — n. Pharm. a wide-spectrum semisynthetic penicillin, CHNOS, used parenterally in the treatment of infections due to Pseudomonas aeruginosa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mezereum mezuzah Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language