noun \lə-ˈk(y)ü-nə\
plural la·cu·nae \-ˈkyü-(ˌ)nē, -ˈkü-ˌnī\

Definition of LACUNA

: a small cavity, pit, or discontinuity in an anatomical structure: as a : one of the follicles in the mucous membrane of the urethra b : one of the minute cavities in bone or cartilage occupied by the osteocytes
la·cu·nar \-ˈk(y)ü-nər\ adjective

Illustration of LACUNA

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