The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
bheu-
DEFINITION:
Also bheu-. To be, exist, grow. Derivatives include be, husband, imp, physics, future, neighbor, and beam. I. Extended forms *bhwiy(o)-,*bhw-.1.be; forebear, from Old English bon, to be, from Germanic *biju, I am, will be. 2.fiat, from Latin fier, to become. 3. Possibly suffixed form *bhw-lyo-, seen by some as the source of Latin flius, son, but this is more likely from dh(i)-. II. Lengthened o-grade form *bhw-.a.bondage, bound4; bustle1, husband, from Old Norse ba, to live, prepare, and bask, to make oneself ready (-sk, reflexive suffix; see s(w)e-); b.Bauhaus, from Old High German ban, to dwell; c.booth, from Middle English bothe, market stall, from a Scandinavian source akin to Old Danish bth, dwelling, stall. ac from Germanic *bwan. III. Zero-grade form *bhu-.1a.build, from Old English byldan, to build, from bold, dwelling, house, from Germanic *buthla-;b.boodle, from Middle Dutch bdel, riches, property, from alternate Germanic form *bthla.2.physic, physics, physio-, physique, phyte, phyto-, phyton; apophysis, diaphysis, diphyodont, epiphysis, euphuism, hypophysis, imp, Monophysite, neophyte, periphyton, symphysis, tracheophyte, from Greek phuein, to bring forth, make grow, phutos,phuton, a plant, and phusis, growth, nature. 3. Suffixed form *bhu-t-.a.eisteddfod, from Welsh bod, to be; b.bothy, from Old Irish both, a hut. 4. Suffixed form *bhu-tu-.future, from Latin futrus, that is to be, future. IV. Zero-grade form *bh- (< *bhu-). 1a.bower1, from Old English br, dwelling space, bower, room; b.neighbor, from Old English gebr, dweller (ge-, collective prefix; see kom); c.Boer, boor, from Middle Dutch gheboer,ghebuer, peasant. ac all from Germanic *bram, dweller, especially farmer. 2.byre, from Old English bre, stall, hut, from Germanic *brjam, dwelling. 3.bylaw, from a Scandinavian source akin to Old Norse br, settlement, from Germanic *bwi-.4. Suffixed form *bh-lo-.phyle, phyletic, phylum; phylogeny, from Greek phlon, tribe, class, race, and phl, tribe, clan. V. Zero-grade reduced suffixal form *-bhw-, in Latin compounds. 1. Latin dubius, doubtful, and dubitre, to doubt, from *du-bhw-io- (see dwo-). 2. Latin probus, upright, from *pro-bhw-o-, growing well or straightforward (see per1). 3. Latin superbus, superior, proud, from *super-bhw-o-, being above (see uper). VI. Possibly Germanic *baumaz (and *bagmaz), tree (? < growing thing). a.beam, from Old English bam, tree, beam; b.boom2, from Middle Dutch boom, tree; c.bumpkin1, bumpkin2, from Flemish boom, tree. (Pokorny bheu- 146.)