Mid 19th century; earliest use found in New York Farmer. From uni- + loculate (although this is first attested slightly later). Compare post-classical Latin uniloculatus.
Definition of uniloculate in US English:
uniloculate
adjective
Having one loculus or cavity; = "unilocular".
Origin
Mid 19th century; earliest use found in New York Farmer. From uni- + loculate (although this is first attested slightly later). Compare post-classical Latin uniloculatus.