Crossword clues for Outermost layer. 4 lettersAnswerClueZESTOutermost layer of a lemonSKINOutermost layer.SKINThe epidermis is its outermost layerBARKOutermost tree layerENAMELTooth's outermost layerEXOCARPOutermost layer, as orange rindOPERACLOAKOutermost layer of a white-tie ensemble, perhapsCRUSTEarth's outermost layerECTODERMOutermost cell layer