natural history

natural disaster

natural

(philosophy, law) natural law

(physics) equilibrium length (length of a spring, etc. at rest)

naturalists (as a group) or naturalist (individual), promoting a closer connection with nature (lifestyle, food, etc.)

spontaneous combustion

to spontaneously combust

natural right

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).