tu·mes·cent
adjective/tjuːˈmesnt/
/tuːˈmesnt/
(formal)- (especially of parts of the body) larger than normal, especially as a result of sexual excitement
（尤指由于性冲动而）胀大的 Word Originmid 19th cent.: from Latin tumescent- ‘beginning to swell’, from the verb tumescere, from tumere ‘to swell’.