The Collaborative International Dictionary of English v.0.48:

Elucidate \E*lu"ci*date\, v. t. [imp. & p. p. Elucidated; p.
   pr. & vb. n. Elucidating.] [LL. elucidatus, p. p. of
   elucidare; e + lucidus full of light, clear. See Lucid.]
   To make clear or manifest; to render more intelligible; to
   illustrate; as, an example will elucidate the subject.
   [1913 Webster]