%expiscate%

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. [ 1913 Webster ]

Dr. Burton has with much ingenuity endeavored to expiscate the truth which may be involved in them. W. L. Alexander. [ 1913 Webster ]