American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Local Malagasy people named them for the unique call they send echoing through Madagascar's forests, which sounds like "shif-auk."
We have examples in the collection of recent well-known extinctions - the great auk (1844), huia (1907), and the passenger pigeon (1914), and many extinct molluscs and insects that are less well-known.— New Humanist Podcast

American Heritage Dictionary (1)
Century Dictionary (1)
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Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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