GRE TOEFL sheath Definition A protective case or covering for a blade or tool. Example "He slid the knife back into its leather sheath." Sign in to save GRE Quiz → TOEFL Quiz → ← shear shed → Study tips featuring "sheath" Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct