(role-playing games) A game master in Dungeons & Dragons games.

(soccer) Manchester United Football Club

(soccer) Manchester City Football Club

A scrum machine

(rugby) A padded, weighty device against which a pack of rugby football forwards can practice scrummaging and rucking. It is used by players of both rugby league and rugby union.

(computing) A computer that implements the von Neumann architecture. / (science fiction) Any machine that is capable of self-replication.

A male adult member of an ethnic group having dark pigmentation of the skin, typically of sub-Saharan African descent; or the appearance thereof.

(computing) A form of garbage collection in which every accessible object in memory is flagged, leaving unflagged only those that are no longer reachable and can thus be discarded.

A red maple, Acer rubrum

A red maple, Acer rubrum