Webster's English Dictionary

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stirps

stirps \'sti(*)rps, 'st*rps\ \'sti(*)r-.pa-s, 'st*r-(.)pe-z\ n or stir.pes 
   [L, lit., stem, stock - more at TORPID] pl  1: a branch of a family or the 
   person from whom it is descended  2a: a group of animals equivalent to a 
   superfamily  2b: a race or fixed variety of plants