EXPISCATE
Etymology
Verb
expiscate (third-person singular simple present expiscates, present participle expiscating, simple past and past participle expiscated)
(transitive, formal) To fish out; to find out by skill or laborious investigation; to search out.
Source: Wiktionary
Ex*pis"cate, v. t. Etym: [L. expiscatus, p.p. of expiscari to fish
out; ex out+piscari to fish, piscis fish.]
Definition: 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 endeavord to expiscate the truth
which may be involved in them. W. L. Alexander.
Source: Webster’s Unabridged Dictionary 1913 Edition