详细解释:n. 外毒素
【化】 外毒素
【医】 外毒素
英语解释：
名词 exotoxin:
a toxin that is secreted by microorganisms into the surrounding medium详细解释：
ex.o.tox.in
n.（名词）A poisonous substance secreted by a microorganism and released into the medium in which it grows.外毒素：由微生物分泌并排入其生长的介质中的有毒物质