The Collaborative International Dictionary of English v.0.48:
Loculus \Loc"u*lus\, n.; pl. Loculi. [L., little place, a compartment.] 1. (Zool.) One of the spaces between the septa in the Anthozoa. [1913 Webster] 2. (Bot.) One of the compartments of a several-celled ovary; loculament. [1913 Webster]WordNet (r) 3.0 (2006):
loculus n 1: a small cavity or space within an organ or in a plant or animal [syn: locule, loculus]