Trinucleus

1 definition found

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

  Trinucleus \Tri*nu"cle*us\, n. [Pref. tri- + nucleus.] (Paleon.)
     A genus of Lower Silurian trilobites in which the glabella
     and cheeks form three rounded elevations on the head.
     [1913 Webster]