The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
gheu-
DEFINITION:
To pour, pour a libation. Oldest form *heu-, becoming *gheu- in centum languages. Derivatives include gut, funnel, fusion, and refund1. I. Extended form *gheud-.1. Zero-grade form *ghud-.gut, from Old English guttas, intestines, from Germanic *gut-.2. Nasalized zero-grade form *ghu-n-d-.foison, fondant, fondue, font2, found2, funnel, fuse2, fusile, fusion; affusion, circumfuse, confound, confuse, diffuse, effuse, infuse, perfuse, profuse, refund, refuse1, refuse2, suffuse, transfuse, from Latin fundere, to melt, pour out. II. Extended form *gheus-.1a.gust1, from Old Norse gustr, a cold blast of wind, from Germanic suffixed form *gustiz;b.gush, from Middle English gushen, to gush, perhaps akin to Icelandic gusa, to gush. Both a and b from Germanic zero-grade form *gus-.2.geyser, from Old Norse geysa, to gush, from Germanic suffixed o-grade form *gausjan.3a. Suffixed zero-grade form *ghus-mo-.chyme; ecchymosis, from Greek khmos, juice; b. suffixed zero-grade form *ghus-lo-.chyle, from Greek khlos, juice. III. Suffixed form *gheu-ti-.futile, from Latin ftilis, (of a vessel) easily emptied, leaky, hence untrustworthy, useless. IV. Basic form *gheu-.choanocyte, parenchyma, from Greek khein, to pour, with o-grade noun khoan, funnel. (Pokorny heu- 447.)