Lewis & Short

urtīca, ae, f. [uro].

  1. I. Lit.
    1. A. A nettle, stinging-nettle, Plin. 21, 15, 55, § 92; 22, 13, 15, § 31; Cat. 44, 15; Hor. Ep. 1, 12, 8; Pers. 6, 70 al.
    2. B. Transf., a sea-nettle, a kind of zoophyte, Plin. 9, 45, 68, § 146; also called marina urtica, Plaut. Rud. 2, 1, 9.
  2. II. Trop., lustful desire, pruriency, Juv. 2, 128; 11, 166 (168).