American Heritage Dictionary
(4)
Century Dictionary
(9)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
As I brought it into the light, I saw that it was a black variety of the puff adder, which is among the most poisonous serpents of Africa.— In the Wilds of Africa
"Thou shalt tread upon the lion and the adder, the young lion and the dragon shalt thou trample under feet And the forces of nature shall be in friendly co-operation.— My Daily Meditation for the Circling Year

American Heritage Dictionary (1)
Century Dictionary (2)
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 several times a year.
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