Webster's Revised Unabridged Dictionary · 1913

Fowl

Fowl (foul) , noun

[Old English foul, fowel, foghel, fuhel, fugel, Anglo-Saxon fugol; akin to Old Saxon fugal Dutch & German vogel, Old High German fogal, Icelandic & Danish fugl, Swedish fogel, fågel, Gothic fugls; of unknown origin, possibly by loss of l, from the root of English fly, or akin to English fox, as being a tailed animal.]

Instead of the pl. Fowls the singular is often used collectively

1.
Any bird; esp., any large edible bird.
Let them have dominion over the fish of the sea, and over the fowl of the air. — Gen. i. 26
Behold the fowls of the air; for they sow not. — Matt. vi. 26
Like a flight of fowl Scattered by winds and high tempestuous gusts. — Shakespeare
2.
Any domesticated bird used as food, as a hen, turkey, duck; in a more restricted sense, the common domestic cock or hen (Gallus domesticus).
Collocations (1)
Barndoor fowl or Barnyard fowl , a fowl that frequents the barnyard; the common domestic cock or hen.

Fowl , intransitive verb

To catch or kill wild fowl, for game or food, as by shooting, or by decoys, nets, etc.
Such persons as may lawfully hunt, fish, or fowl. — Blackstone
Collocations (1)
Fowling piece , a light gun with smooth bore, adapted for the use of small shot in killing birds or small quadrupeds.