Source : Webster's Revised Unabridged Dictionary (1913)

Jugum \Ju"gum\, n.; pl. L. {Juga}, E. {Jugums}. [L., a yoke,
   ridge.] (Bot.)
   (a) One of the ridges commonly found on the fruit of
       umbelliferous plants.
   (b) A pair of the opposite leaflets of a pinnate plant.