What does aculeate mean?
The definition of aculeate
A*cu”le*ate, a.
Etym: [L. aculeatus, fr. aculeus, dim. of acus needle.]

1 (Zoöl.)
Having a sting; covered with prickles; sharp like a prickle.
2 (Bot.)
Having prickles, or sharp points; beset with prickles.
3 Severe or stinging; incisive. [R.] Bacon.