The Collaborative International Dictionary of English v.0.48:

Orchis \Or"chis\, prop. n.; pl. Orchises. [L., fr. Gr. ? a
   testicle, the orchis; -- so called from its tubers.]
   [1913 Webster]
   1. (Bot.) A genus of endogenous plants growing in the North
      Temperate zone, and consisting of about eighty species.
      They are perennial herbs growing from a tuber (beside
      which is usually found the last year's tuber also), and
      are valued for their showy flowers. See Orchidaceous.
      [1913 Webster]

   2. (Bot.) Any plant of the same family with the orchis; an
      orchid.
      [1913 Webster]

   Note: The common names, such as bee orchis, fly orchis,
         butterfly orchis, etc., allude to the peculiar form
         of the flower.
         [1913 Webster]

WordNet (r) 3.0 (2006):

orchis
    n 1: any of various deciduous terrestrial orchids having fleshy
         tubers and flowers in erect terminal racemes
    2: one of the two male reproductive glands that produce
       spermatozoa and secrete androgens; "she kicked him in the
       balls and got away" [syn: testis, testicle, orchis,
       ball, ballock, bollock, nut, egg]