Expiscate

Ex*pis"cate (?), v. t. [L. expiscatus, p. p. of expiscari to fish out; ex out+piscari to fish, piscis fish.] To fish out; to find out by skill or laborious investigation; to search out. "To expiscate principles." [R.] Nichol.

Dr. Burton has with much ingenuity endeavored to expiscate the truth which may be involved in them.
W. L. Alexander.