The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
bhelgh-
DEFINITION:
To swell. Extension of bhel-2. Oldest form *bhelh-, becoming *bhelgh- in centum languages. 1. O-grade form *bholgh-.bellows, belly, from Old English bel(i)g,bælig, bag, bellows, from Germanic *balgiz.2. Zero-grade form *bhgh-.billow, from Old Norse bylgja, a wave, from Germanic *bulgjan.3. Zero-grade form *bhgh-.bolster, from Old English bolster, cushion, from Germanic *bulgstraz.4. O-grade form *bholgh-.blagging, budget, bulge, from Latin bulga, leather sack, from Celtic *bolg-. (Pokorny bhelh- 125.)
h-, becoming *bhelgh- in centum languages. 1. O-grade form *bholgh-. bellows, belly, from Old English bel(i)g, bælig, bag, bellows, from Germanic *balgiz. 2. Zero-grade form *bh
gh-. billow, from Old Norse bylgja, a wave, from Germanic *bulgjan. 3. Zero-grade form *bh
