Answer: umbones

AnswerCrossword Clue
UMBONESBosses of shields
umbonesany similar boss or protuberance
umbonesUMBO, the rounded elevation at the centre of a shield
umbonesboss on a shield, as one at the center of a circular shield
umbonesthe beak of a bivalve shell; the protuberance of each valve above the hinge
umbonesthe depressed area on the outer surface of the tympanic membrane