plural of natural historian

One who studies natural history.

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

(philosophy, metaphysics) Philosophical worldview which holds that there is nothing but natural elements, principles, and relations of the kind studied by the natural sciences.

plural of natural law

(archaic) One with a simple mind; a fool or idiot.

plural of half-natural

(usually of death or dying) Causes such as illness or disease.

(category theory) A natural transformation whose every component is an isomorphism.

A kind of proof calculus in which logical reasoning is expressed by inference rules closely related to the "natural" way of reasoning, in contrast to axiomatic systems.