aculeus
刺,螫刺
A·cu·le·us n.; pl. Aculei
1. Bot. A prickle growing on the bark, as in some brambles and roses.
2. Zool. A sting.
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aculeus
n 1: a stiff sharp-pointed plant process
2: a sharp-pointed process especially a sting of a
hymenopterous insect