Refers to the state of being naked or a naked human body. Often used in artistic, medical, or descriptive contexts.
We did sketches of nude figures in art class.
He walked around the room completely naked.
裸体 is a formal, literary term for a naked body often used in art criticism, whereas ヌード is the more casual loanword used in everyday and media contexts.
裸体 specifically means a nude body (of either sex), whereas 女体 refers to a woman's body regardless of whether it is clothed.
Compound of 裸 (ra, 'naked') and 体 (tai, 'body'). The reading ら is the on'yomi of 裸, and たい is the on'yomi of 体.