Mashie Niblick
Term used for a 6/7 iron in the early 1900's.

Match play
A form of golf play where players or teams compete against each other on a hole-by-hole basis.

Medal play
Style of scoring in which the player with the fewest strokes wins. Most professional tournaments are medal play. Also known as "stroke play".

Member's bounce
Any favourable bounce of the golf ball that improves what initially appeared to be an errant shot.

Mis-read
When a player takes an incorrect line on a putt.

Mulligan
A do-over, or replay of the shot. It is not allowed by the rules and not practiced in tournaments, but is common in casual rounds in some countries, especially the United States.