excrescence
n.
early 15c., "action of growing out," from Latin excrescentia (plural) "abnormal growths," from excrescentem (nominative excrescens), present participle of excrescere "grow out, grow up," from ex- "out" (see ex-) + crescere "to grow" (see crescent). Meaning "that which grows out abnormally" (on a living thing) is from 1570s (excrescency in this sense is 1540s).
〔李〕[ex-=out出；cresc=to grow生长；-ence n.=the result表行为结果→“growing or growth which is out of the normal state超出正常状态的生长物”→] n. ① abnormal outgrowth 赘生物，瘤