Webster's English Dictionary

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ruga

ru.ga \'ru:-g*\ \-.gi-, -.ge-, -.je-\ \'ru:-g*l\ \'ru:-.ga-t\ n or ru.gae 
   [NL, fr. L, wrinkle - more at ROUGH] pl  : a visceral fold or wrinkle - 
   used chiefly in pl.  - ru.gal aj