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ankle-length
ankle sock
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ankyloglossia
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anion
an·i·on [ á n ən ] (plural an·i·ons)


noun 
Definition:
 
negative ion: a negatively charged ion, especially one that is attracted to an anode, either during electrolysis or within a vacuum tube
[Mid-19th century. Blend of anode + ion]

an·i·on·ic [ àn ī ónnik ] adjective
an·i·on·i·cal·ly adverb
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