Expiscate
Expiscate , transitive verb
[Latin expiscatus, past participle 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. [Rare]
To expiscate principles.
Dr. Burton has with much ingenuity endeavored to expiscate the truth which may be involved in them.