Webster's English Dictionary

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jugum

ju.gum \'ju:-g*m\ \-g*\ n or ju.ga or jugums [NL, fr. L, yoke - more at 
   YOKE] pl  1: a pair of the opposite leaflets of a pinnate leaf  2: the most 
   posterior and basal region of an insect's wing modified in some  
   lepidopterans into a lobe that couples the fore and hind wings during 
   flight