A dose of absorbed radiation equivalent to one roentgen of X-rays or gamma rays

(computing) A remark; a programming language statement used for documentation (in BASIC for example); also used in DOS batch files.

(knitting) remaining

(web design) A unit relative to the declared font size of the root element in a HTML document.

(law) Against a thing (such as property) rather than a person.

(mythology) An Egyptian fish god who fertilized the land with his tears.

(colloquial) A Remington firearm.

Third-person singular simple present indicative form of rem out

The stage of sleep during which most brain activity and dreams occur, characterised by rapid eye movement (REM).

Pertinent; relevant.