One who studies natural history.

Alternative letter-case form of Book of Nature

A religious and philosophical concept originating in the Latin Middle Ages which views nature as a book to be read for knowledge and understanding.

(now archaic) The genitals. / (now rare) Someone's innate, untaught talents or skill.

(idiomatic, euphemistic) To satisfy a bodily urge to urinate or defecate.

A hypothetical alternative to the anthropic principle that attempts to explain the complexity of the universe

(immunology) Any cell that expresses cell surface receptors that deliver signals to either activate or inhibit a response as part of the innate immune system.

(law) Any of various sexual deviations that, at one time or another, have been considered to be so unnatural as to be illegal.

(Canada, politics, slang) The Liberal Party of Canada (LPC).

Timing sexual intercourse to avoid the time of ovulation (if pregnancy is not wanted) or to fall within that time (if pregnancy is desired).