The Collaborative International Dictionary
Acanthocephalous
Acanthocephalous \A*can`tho*ceph"a*lous\, a. (Zo["o]l.) Having a spiny head, as one of the Acanthocephala.
Wiktionary
acanthocephalous
a. (context zoology English) Having a spiny head, as one of the Acanthocephala.