The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
wem-
DEFINITION:
To vomit. Oldest form *wem1-.1.wamble, from Middle English wam(e)len, to feel nausea, stagger, from a Scandinavian source probably akin to Old Norse vamla, qualm, and Danish vamle, to become sick, from Germanic *wam-.2.vomit; nux vomica, from Latin vomere, to vomit. 3.emesis, emetic, from Greek emein, to vomit. (Pokorny em- 1146.)
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em- 1146.) 
