(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

Made or distributed without the ability to enforce regional lockout.

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

plural of regional lockout

(aviation) a small narrow-bodied jetliner designed to carry 30-150 passengers in one class for flight segments of 2000 kms or less.

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

(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.

(chemistry) The chemistry of regioselective reactions

(topology) A connected component of the complement in a manifold of a lamination of that manifold.