The Collaborative International Dictionary of English v.0.48:

Lienculus \Li*en"cu*lus\ (l[-i]*[e^][ng]"k[-u]*l[u^]s), n.; pl.
   Lienculi (l[-i]*[e^][ng]"k[-u]*l[imac]). [NL., dim. of L.
   lien the spleen.] (Anat.)
   One of the small nodules sometimes found in the neighborhood
   of the spleen; an accessory or supplementary spleen.
   [1913 Webster]