RhymeZone: jugum definitions

Definitions of jugum:

noun: (zootomy) A connecting ridge or projection, especially on a bone.
noun: (entomology) A lobe on the forewing of some moths which interlocks with the hindwing in flight.
noun: (botany) One of the ridges commonly found on the fruit of umbelliferous plants.
noun: (botany) A pair of opposite leaflets of a pinnate plant.

(Definitions from Wiktionary)