Source : Webster's Revised Unabridged Dictionary (1913)

Pseudonavicula \Pseu`do*na*vic"u*la\, n.; pl.
   {Pseudonavicul[ae]}. [NL., fr. Gr. pseydh`s false + NL.
   navicula, a genus of diatoms. See {Navicular}.] (Zo["o]l.)
   One of the minute spindle-shaped embryos of Gregarin[ae] and
   some other Protozoa.