The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
gal-
DEFINITION:
To call, shout. 1.call, from Old Norse kalla, to call, from Germanic expressive form *kall-.2.clatter, from Old English *clatrian, to clatter, from Germanic *klat-.3. Expressive form *gall-.gallinaceous, gallinule, from Latin gallus, cock (< the calling bird; but probably also associated with Gallus, Gallic, as if to mean the bird of Gaul, the cock being archaeologically attested as an important symbol in the iconography of Roman and pre-Roman Gaul). 4. Suffixed form *gal-so-.glasnost, from Old Church Slavonic glas, voice. 5. Reduplicated form *gal-gal-.Glagolitic, from Old Church Slavonic glagol, word. (Pokorny 2. gal- 350.)