mother tongue

language that one first learned to speak as a child; one's native language 母语; 本国语; 本族语.

mosquito, mosquito-net, moss, moss-grown, mossback, mossy, most, mostly, MOT, mote, motel, motet, moth, moth-eaten, mothball, mother, mother country, Mother Nature, mother ship, Mother Superior, mother's boy, Mother's Day, mother-in-law, mother-of-pearl, mother-to-be, motherhood, motherland, motherless, motherlike, motherliness, motherly, mothproof, motif, motile, motility, motion, motion picture, motionless, motivate, motivated,