Etymology
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aetio- 

word-forming element used in chemistry and indicating "a fundamental degradation product of a complex organic compound" [Flood], from Latinized combining form of Greek aitia "a cause, an origin" (see etiology). In older, general use it has been reduced in English to etio- (see æ (1)).

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Afro- 

word-forming element meaning "African," from Latin Afr-, stem of Afer, Afri "African" (noun and adjective; see Africa), or directly from African.

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al- 

in words from Arabic (or assumed to be), it is the definite article "the." Sometimes rendered in English as el-. Often assimilated to following consonants (as-, az-, ar-, am-, an-, etc.). Examples include almanac, alchemy, alcohol, algebra.

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allo- 

word-forming element meaning "other," from Greek allos "other, different," cognate with Latin alius "other," from PIE root *al- (1) "beyond."

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alti- 

word-forming element meaning "high," sometimes also alto- (in cloud names, etc.), from Latin altus "high," literally "grown tall," from PIE root *al- (2) "to grow, nourish."

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ambi- 

word-forming element meaning "both, on both sides," from Latin ambi- "around, round about" (before vowels amb-, also sometimes reduced to am-, an-), from PIE root *ambhi- "around," which is probably an ablative plural (*ant-bhi "from both sides") of *ant- "front, forehead."

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Americo- 

word-forming element used since late 18c. as "of or about America."

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amino- 

1887 as an element in compound words in chemistry, from combining form of amine. Amino acid is attested from 1898.

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amphi- 

before a vowel amph-, word-forming element meaning "on both sides, of both kinds; on all sides, all around," from Greek amphi (prep., adv.) "round about, on both sides of, all around; about, regarding," which is cognate with Latin ambi-, both from PIE root *ambhi- "around."

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amylo- 

word-forming element in modern chemistry, combining form of amyl (q.v.).

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