(geology) A large or rich vein of gold or of another precious mineral from which other branches extend. / (idiomatic, by extension) Any source of valuable or useful material.

(US, Canada) A day in honor of one's mother on the second Sunday in May in the United States and Canada.

plural of mothball

Receiving the care and attention of a mother.

simple past tense and past participle of mother

Thick, like mother (film or membrane on fermented liquids); viscid.

Resistant to being eaten by moths.

To apply odoriferous materials intended to repel moths from clothing.

present participle of mothball

The act of something being mothballed: taken out of service and stored for possible later use.