The Collaborative International Dictionary of English v.0.48:

Anacardium \An`a*car"di*um\, n. [NL., fr. Gr. ? similar to + ?
   heart; -- the fruit of this plant being thought to resemble
   the heart of a bird.] (Bot.)
   A genus of plants including the cashew tree. See Cashew.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Anacardium
    n 1: type genus of the Anacardiaceae: cashew [syn: Anacardium,
         genus Anacardium]