Prosiphon

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Prosiphon \Pro*si"phon\, n. [Pref. pro- for + siphon.] (Zool.)
     A minute tube found in the protoconch of ammonites, and not
     connected with the true siphon.
     [1913 Webster]