Source : Webster's Revised Unabridged Dictionary (1913)

Loculus \Loc"u*lus\, n.; pl. {Loculi}. [L., little place, a
   compartment.]
   1. (Zo["o]l.) One of the spaces between the septa in the
      Anthozoa.

   2. (Bot.) One of the compartments of a several-celled ovary;
      loculament.

Source : WordNet®

loculus
     n : a small cavity or space within an organ or in a plant or
         animal [syn: {locule}]
     [also: {loculi} (pl)]

loculi
     See {loculus}