Source : Webster's Revised Unabridged Dictionary (1913)

Phloem \Phlo"["e]m\, n. [Gr. ? bark.] (Bot.)
   That portion of fibrovascular bundles which corresponds to
   the inner bark; the liber tissue; -- distinguished from
   xylem.

Source : WordNet®

phloem
     n : (botany) tissue that conducts synthesized food substances
         (e.g., from leaves) to parts where needed; consists
         primarily of sieve tubes [syn: {bast}]