Wordnet 3.0
NOUN (2)
1.
a stiff sharp-pointed plant process;
2.
a sharp-pointed process especially a sting of a hymenopterous insect;
The Collaborative International Dictionary of English v.0.48:
Aculeus \A*cu"le*us\, n.; pl. Aculei. [L., dim. of acus
needle.]
1. (Bot.) A prickle growing on the bark, as in some brambles
and roses. --Lindley.
[1913 Webster]
2. (Zool.) A sting.
[1913 Webster]
WordNet (r) 3.0 (2006):
aculeus
n 1: a stiff sharp-pointed plant process
2: a sharp-pointed process especially a sting of a hymenopterous
insect