Definition of orbitoline in US English:

orbitoline

adjective

  • Originally: of, relating to, or resembling the extinct genus Orbitolina of foraminiferans. Later: = orbitolinid.

noun

  • Originally: a foraminiferan of this genus. Later: = orbitolinid.

Origin

Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin Orbitolina, genus name from orbitol- (in Orbitolites) + -ina.