(euphemistic) Synonym of menstruation: the monthly period during which a fertile woman menstruates.

(UK) A hooligan who creates bother (trouble), specifically a member of a skinhead gang.

(military) A prepackaged meal, easily prepared and eaten, carried by military troops on the battlefield.

(graph theory, of a graph) Such that there exists a finite vertex set so that for any vertex there exists another vertex in that finite set and an injective homomorphism of the graph that maps the ...