Webster's Revised Unabridged Dictionary · 1913

Quab

Quab , noun

[Compare Dutch kwab eelpout, Danish quabbe, German quabbe, quappe, LG. quabbe a fat lump of flesh, and Latin capito a kind of fish with a large head, from caput the head, also English squab.]

An unfledged bird; hence, something immature or unfinished. — Ford

Quab , intransitive verb

See Quob, v. i.