Lewis & Short

nectărĕus (nectărĭus), a, um, adj. [nectar],

  1. I. of or belonging to nectar, nectared: nectareis quod alatur aquis, Ov. M. 7, 707.
  2. II. Transf.
    1. A. Sweet or delicious as nectar: Falernum, Mart. 13, 108: fontes, Claud. Nupt. Honor. et Mar. 209.
    2. B. Subst.: nectărĕa, ae, f. (sc. herba), the plant elecampane, used for flavoring wine, which was hence called nectarites, Plin. 14, 16, 19. § 108.