(1):

(n.) The food of certain small bark beetles, family Scolytidae believed to be fungi cultivated by the beetles in their burrows.

(2):

(n.) The fabled food of the gods (as nectar was their drink), which conferred immortality upon those who partook of it.

(3):

(n.) Formerly, a kind of fragrant plant; now (Bot.), a genus of plants, including some coarse and worthless weeds, called ragweed, hogweed, etc.

(4):

(n.) An unguent of the gods.

(5):

(n.) A perfumed unguent, salve, or draught; something very pleasing to the taste or smell.