Webster's English Dictionary

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libido

li.bi.do \l*-'be-d-(.)o-, -'bi-d-\ n [NL libidin-, libido, fr. L, desire, 
   lust, fr. libe-re to]please - more at LOVE 1: emotional or psychic energy 
   derived from primitive biological urges and  usu. goal-directed 2: sexual 
   drive