n.
Function: noun
Etymology: Middle English, from Anglo-French, from Vulgar Latin *mina, probably of Celtic origin; akin to W mwyn ore
Date: 14th century
1 a : a pit or excavation in the earth from which mineral substances are taken b : an ore deposit
2 : a subterranean passage under an enemy position
3 : an encased explosive that is placed in the ground or in water and set to explode when disturbed
4 : a rich source of supply