Definition of orbicule in US English:

orbicule

noun

  • 1Geology. A spheroidal inclusion in an igneous rock; specifically an inclusion composed of a number of concentric layers. Compare earlier "orbicular".

  • 2Botany. Any of the small droplets of lipid found in tapetal cells of the anther of certain plants, which are released from the cells with a covering of sporopollenin.

Origin

1930s; earliest use found in Albert Johannsen (1871–1962). From orbicular: see -cule.

Pronunciation

orbicule

/ˈɔːbɪkjuːl/