machair (plural machairs)
- (geology) A type of calcareous sandy terrain formed mostly from seashells, found by the coast in areas of Scotland and Ireland.
- (geography) extensive low-lying fertile plain, level country
- (geography) the southern or low-lying parts of Scotland
- (geography) extensive beach
- (geography) low and level part of a farm
- (geography, in the plural) long ranges of sandy plains fringing the Atlantic side of the Outer Hebrides