'Thorn-headed worm' definitions:
Definition of 'Thorn-headed worm'
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Thorn-headed \Thorn"-head`ed\, a.
Having a head armed with thorns or spines.
[1913 Webster]
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Thorn-headed worm (Zool.), any worm of the order
Acanthocephala; -- called also thornhead.
[1913 Webster]
