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Webster's Dictionary (1865)

Rū-gōse', a.

adjective

(125), a. [Fr. rugosus, from ruga, a wrinkle, It., Sp. & Pg. rugoso, Pr. rugos, Fr. rugueux.]

  1. Wrinkled; full of wrinkles. Wiseman.
  2. (Bot.) Having the veins more contracted than the disk, so that the latter rises into little inequalities, as in sage, primrose, cowslip, &c.;—said of leaves.