Source : Webster's Revised Unabridged Dictionary (1913)

Pederasty \Ped"er*as`ty\, n. [Gr. paiderasti`a: cf. F.
   p['e]d['e]rastie.]
   The crime against nature; sodomy.

Source : WordNet®

pederasty
     n : sexual relations between a man and a boy (usually anal
         intercourse with the boy as a passive partner) [syn: {paederasty}]