ETYM From Bump to strike, to thump.
1. A lump on the body caused by a blow.
2. An impact (as from a collision); SYN. blow.
ETYM French excrescence, excroissanse, Latin excrescentia excrescences, neut. pl. of p. pr. of excrescere. Related to Excrescent.
An abnormal outgrowth or enlargement of some part of the body.