(cricket) A rule governing the placement of fielders (within an oval drawn on the pitch) at certain times during the innings of a one-day match.

(genetics) An endonuclease that catalyzes double-strand cleavage of DNA containing a specific sequence.

(computing) A function used in an operating system that is not available to application programs.

plural of restriction enzyme

(rail transport, UK) Having a restrictive loading gauge, limiting which rail vehicles may be used.

plural of width restriction

a place on a road, street or approach to a bridge where the width is restricted by means of posts or bollards on either side. These are designed to limit the size and weight of vehicles that use the road.

plural of field restriction

(computer science, type theory) In a functional language, inference of a polymorphic type only for syntactic values (values that can be evaluated at compile time) to ensure that a program is type-safe.

plural of restricted byway