1. [n]  (classical mythology) the food and drink of the gods; mortals who ate it became immortal
2. [n]  fruit dessert made of oranges and bananas with shredded coconut
3. [n]  any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
4. [n]  a mixture of nectar and pollen prepared by worker bees and fed to larvae

Ambrosia
Ambrosia

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1. \Am*bro"sia\ (?; 277), n. [L. ambrosia, Gr. ?, properly
   fem. of ?, fr. ? immortal, divine; 'a priv. + ? mortal
   (because it was supposed to confer immortality on those who
   partook of it). ? stands for ?, akin to Skr. mrita, L.
   mortuus, dead, and to E. mortal.]
   1. (Myth.)
      (a) The fabled food of the gods (as nectar was their
          drink), which conferred immortality upon those who
          partook of it.
      (b) An unguent of the gods.
                His dewy locks distilled ambrosia. --Milton.
   2. A perfumed unguent, salve, or draught; something very
      pleasing to the taste or smell. --Spenser.
   3. Formerly, a kind of fragrant plant; now (Bot.), a genus of
      plants, including some coarse and worthless weeds, called
      ragweed, hogweed, etc.
   

2. \Am*bro"sia\, n. (Zo["o]l.)
   The food of certain small bark beetles, family {Scolytid[ae]}
   believed to be fungi cultivated by the beetles in their
   burrows.