Dictionary.net

• Without the preoral circlet of cilia; trochophore stage when the preoral circlet is absent and the surface is covered uniformly with cilia.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.

• [Greek] Without preoral circlet of cilia; appl. trochophore when preoral circlet is absent and surface is uniformly ciliated.

1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth