inguen

from WordNet (r) 3.0 (2006)

inguen
    n 1: the crease at the junction of the inner part of the thigh
         with the trunk together with the adjacent region and often
         including the external genitals [syn: {groin}, {inguen}]

from The Collaborative International Dictionary of English v.0.48

Inguen \In"guen\, n. [L. inguen, inguinis.] (Anat.)
   The groin.
   [1913 Webster]