(astronomy, geology, planetary geology) Any large area of a planet or moon that is strongly differentiated from neighbouring areas by colour or albedo.

(chemistry) region

A region, smaller than an ecozone, that contains a distinct biodiversity of flora and fauna.

(chemistry) The chemistry of regioselective reactions

plural of regional lockout

(often pluralized) Hell; a realm beneath the surface of the earth conceived as the abode of the souls of the dead and, sometimes, as the abode of demons or evil spirits.

The central part of the (notably human) body near the pubes and the pubis, including the genitalia.

Made or distributed without the ability to enforce regional lockout.

In a regiochemical manner / With regard to regiochemistry.

(chemistry) control of the regiochemistry of a reaction