American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Most of these antibiotics, such as streptomycin and tetracycline, are derivatives of natural compounds released by microbes (often fungi or soil bacteria) to kill competitors found nearby in the environment.— Medlogs - Recent stories

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
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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