dwo- The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.

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The American Heritage^® Dictionary of the English Language: Fourth Edition. 2000.

Appendix I

Indo-European Roots

ENTRY:	dwo-
DEFINITION:	Two. Derivatives include twilight, biscuit, between, combine, diploma, and doubt. I. Variant form duwo. 1a.* two, from Old English tw, two (nominative feminine and neuter); b. twain; twayblade, from Old English twgen, two (nominative and accusative masculine). Both a and b from Germanic twa, two. 2. twelfth, twelve, from Old English twelf,* twelve, and twelfta, twelfth, from Germanic compound twa-lif-, “two left (over from ten),” twelve (-lif-, left; see leik^w-). II. Adverbial form dwis and combining form dwi-. 1a. twibill, twilight, from Old English twi-, two; b. zwieback, zwitterion, from Old High German zwi-, twice. Both a and b from Germanic twi-. 2. bi-¹, bis; balance, barouche, bezel, biscuit, bistort, from Latin bis* (combining form bi-), twice. 3. di-¹, from Greek dis (combining form di-), twice. 4. twist, from Old English -twist, divided object, fork, rope, from Germanic twis. 5. twice, from Old English twige,* twiga, twice, from Germanic twiyes. 6. twenty, from Old English twntig,* twenty, from Germanic compound twgentig, “twice ten” (-tig, ten; see dek). 7. twine, from Old English twn, double thread, from Germanic twhna, double thread, twisted thread. 8. between, betwixt, twixt, from Old English betwonum* and betweox, betwix, between, from Germanic compounds bi-twhna and bi-twisk, “at the middle point of two” (bi, at, by; see ambhi). 9. twill, from Old English twilic, woven of double thread, from Germanic compound twilic-, “two-threaded fabric.” 10.* Suffixed form dwis-no-. a. twin, from Old English twinn,* getwinn, two by two, twin, from Germanic twisnaz, double; b. bi-¹, binal, binary; combine, pinochle, from Latin bn,* two by two, two each. 11. Suffixed form dwi-ko-. twig¹, from Old English twigge,* a branch, from Germanic twig(g)a, a fork. 12.* Compound dwi-plo-, twofold (-plo-, -fold; see pel-²). diplo-, diploe, diploid, diploma; anadiplosis, diplodocus, from Greek diploos, diplous, twofold. 13. Suffixed reduplicated form dwi-du-mo-. didymium, didymous; epididymis, from Greek didumos,* double, the testicles. 14. Suffixed form dwi-gha. dichasium, dicho-, from Greek dikha,* in two. III. Inflected form duw. 1. deuce¹, dozen, dual, duet, duo, duo-; duodecimal, duumvir, from Latin duo,* two. 2. duad, dyad; dodecagon, hendiadys, from Greek duo, du, two. IV. Variant form du-. 1. Compound du-plo-, twofold (-plo-, -fold; see pel-²). double, doublet, doubloon, duple, from Latin duplus,* double. 2. Compound du-plek-, twofold (-plek-, -fold; see plek-). duplex, duplicate, duplicity; conduplicate, from Latin duplex, double. 3. Suffixed form du-bhw-io-. doubt, dubious; redoubtable, from Latin dubius,* doubtful (< “hesitating between two alternatives”), and dubitre, to be in doubt. (Pokorny d(u) 228.)


The American Heritage^® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.

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