Source : Webster's Revised Unabridged Dictionary (1913)

Quab \Quab\, n. [Cf. D. kwab eelpout, Dan. quabbe, G. quabbe,
   quappe, LG. quabbe a fat lump of flesh, and L. capito a kind
   of fish with a large head, fr. caput the head, also E.
   squab.]
   An unfledged bird; hence, something immature or unfinished.
   --Ford.

Quab \Quab\, v. i.
   See {Quob}, v. i.