from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A person who has special knowledge or experience; an expert.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A self-styled expert in a given field.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. someone who is dazzlingly skilled in any field
Yiddish meyvn, from Hebrew mēbîn, active participle of hēbîn, to understand, derived stem of bîn, to discern; see byn in Semitic roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Yiddish מבֿין (meyvn, "know-it-all"), from Hebrew מֵבִין (mevín, "one who understands, connoisseur, expert"). (Wiktionary)