Definition of exintine in English:

exintine

noun

Botany
  • Originally: an additional layer of the wall of a pollen grain which is found between the intine and exine and lies next to or resembles the intine (now rare). In later use also: the outermost layer of the intine of the pollen grain of certain plants.

Origin

Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From German Exintine from Ex- + Intine.