/ Dictionary / Index M mothball: Meaning and Definition of Find definitions for: moth•ball Pronunciation: (môth'bôl", moth'-), [key] — n. a small ball of naphthalene or sometimes of camphor for placing in closets or other storage areas to repel moths from clothing, blankets, etc. in disuse or in storage, esp. with reference to standby equipment. (of ideas) dismissed as unworthy of further deliberation. —v.t. to put into storage or reserve; inactivate. —adj. inactive; unused; stored away: a mothball fleet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mothball (Thesaurus) moth moth bean Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language