plural of slide rule

(logic, proof theory) A rule for combining (or modifying) well-formed formulas of a formal language in a truth-preserving manner (to yield new well-formed formulas).

plural of inference rule

(law) A notion of what should "count" as law.

(photography, film, visual arts) A normative rule that an image should be mentally or representationally divided in three horizontally and diagonally, and that the focus of the image should not be in the center of the resulting shape.

A doctrine in antitrust law which applies to contracts which "unreasonably" inhibit trade.

(Internet slang, fandom slang, informal) The proposition that it is possible to find genderswapped versions of every fictional character, especially as fan art on the internet.

(Ireland) international rules football

(sports) A rule requiring that a player receive medical attention before continuing to play if he is bleeding or there is blood on him or his clothes.

plural of blood rule