[医] 棘头纲

[ noun ]
phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms
<noun.animal>

Acanthocephala \A*can`tho*ceph"a*la\, n. pl. [NL., from Gr. ? a
spine, thorn + ? head.] (Zo["o]l.)
A group of intestinal worms, having the proboscis armed with
recurved spines.