Top Definition
A filter feeding Protostome that have free roaming larva. Include flatworms, rotifers and lophoporates.

A dumb head.
"jeez Oss is such a Lophotrochozan!"
by Mc The Luminous Force February 25, 2004
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.