American Heritage Dictionary
(1)
Century Dictionary
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GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Most petal iridescence is at the ultraviolet end of the light spectrum which is visible to insects but not to humans, found the study which has appeared in the latest issue of the 'Science' journal.— The Times of India

Century 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 twice a year.
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