(Internet slang, vulgar) Initialism of rolling on the floor laughing my motherfucking ass/arse off.

(chemistry) Any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.

(architecture) A sturdy timber with a curve or angle used for primary framing of a timber house, usually used in pairs.

The condition of being sesquilingual; the ability to speak one language fluently, and a second language only to a limited extent.