actinula

1 definition found

actinula - Collaborative International Dictionary of English v.0.48 :

  Actinula \Ac*tin"u*la\, n. pl. [NL., fr. Gr. ?, ?, a ray.]
     (Zool.)
     A kind of embryo of certain hydroids (Tubularia), having a
     stellate form.
     [1913 Webster]