Definition of loculi:
(n) :
A little place or space; a cell; a chamberlet.
(n) :
In ancient catacombs and tombs of some types, a small separate chamber or recess cut into the rock, for the reception of a body or urn.
(n) :
(botany) One of the compartments of a several-celled ovary.
(n) :
(zoology) One of the spaces between the septa in the Anthozoa.