/ Dictionary / Index M Malay Peninsula: Meaning and Definition of Find definitions for: Ma'lay Penin'sula Pronunciation: [key] a peninsula in SE Asia, consisting of W (mainland) Malaysia and the S part of Thailand. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Malayo-Polynesian Malaysia Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language