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ethylene
ethylene glycol
ethylene oxide
ethyne
ethynyl
-etic
etic
etiolated
etiology
etioplast
etiquette
ETM
Etna, Mount
ETO
Eton (1)
Eton (2)
Eton collar
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etiology

e·ti·ol·o·gy [ tee ólləjee ] (plural e·ti·ol·o·gies) or ae·ti·ol·o·gy [ tee ólləjee ] (plural ae·ti·ol·o·gies)


noun 
Definition:
 
1. study of causes: the philosophical investigation of causes and origins

2. medical specialty: the branch of medicine that investigates the causes and origins of disease

3. cause of disease: the set of factors that contributes to the occurrence of a disease

[Mid-16th century. Via Latin< Greek aitiologia "statement of the cause" < aita "cause"]

e·ti·o·log·ic [ tee ə lójjik ] adjective
e·ti·o·log·i·cal·ly adverb
e·ti·ol·o·gist noun
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