Motherlode Definition

noun

(literally) The main, central lode of a natural resource, near which smaller deposits of the same ore etc. exist.

Once the Western mining company has exploited a motherlode with state of the art equipment, it often abandons the minor lodes to primitive local enterprise.
Wiktionary

(figuratively) The main prize, best cut or pick etc. by far, dwarfing all others.

Luckily the philistine castle-burglars missed the motherlode: his lordship's historical memorabilia collection.
Wiktionary

Other Word Forms of Motherlode

Noun

Singular:
motherlode
Plural:
motherlodes

Origin of Motherlode

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motherlode