American Heritage Dictionary
Century Dictionary
(2)
GNU Webster's 1913
WordNet
Elsewhere on the web
Prior to swarming, the locusts undergo a series of dramatic physical changes - their body colour darkens and their muscles grow stronger.— BBC News | News Front Page | World Edition
The only change they found was that when the insects were swarming, they had about three times more serotonin in their systems than when they were living as solitary creatures.— - Latest Popular Stories, Instablogs Community

Century Dictionary (1)
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