noun | a small cavity or space within an organ or in a plant or animal

loc-u-lus (7 letters | 3 syllables)

locule

bodily cavity | cavity | cavum

(none among common words)

loculus.com | loculus.org | loculus.info | loculus.biz

Catacomb recess (based on all New York Times crossword puzzles 1994 to 2009)

9 (International English) | 9 (North American English)

(???) 562-8587