名詞 chancre:

1. a small hard painless nodule at the site of entry of a pathogen (as syphilis)

chan.cre

n.（名詞）
A dull red, hard, insensitive lesion that is the first manifestation of syphilis.
下疳：一種暗紅色堅(jiān)硬不敏感的引起機(jī)能障礙的一種病，為梅毒的初期癥狀
An ulcer located at the initial point of entry of a pathogen.
初瘡：病原體最初侵入的那點(diǎn)處的潰瘍

來源：
French
法語
from Old French
源自 古法語
from Latin cancer [tumor, crab] * see kar-
源自 拉丁語 cancer [腫瘤，蟹] *參見 kar-

【引伸】
chan.crous