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
The ancient Greeks borrowed from the Hebrew by turning aleph and bet (the first two letters of the Hebrew alphabet, respectively) into alpha and beta, which is where the English word originates.— mental_floss Blog
"hemoglobin beta chain (valine replacing glutamate in position— VERBATIM: The Language Quarterly Vol XI No 3
Beta has been looked up 1126 times, favorited 0 times, listed 22 times, and commented on 6 times.

American Heritage Dictionary (1)
Century Dictionary (2)
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