Definition of framboid in US English:

framboid

noun

Geology
  • A microscopic, roughly spherical aggregate of a mineral (especially pyrite) in sedimentary rock, typically occurring in a spheroidal cluster of such aggregates.

Origin

1960s. From framb- + -oid, on account of a supposed resemblance of a cluster under magnification to a raspberry.

Pronunciation

framboid

/ˈframbɔɪd/