duckweed

[duhk-weed]

duck·weed

[duhk-weed]
noun
any plant of the family Lemnaceae, especially of the genus Lemna, comprising small aquatic plants that float free on still water.

Origin:
1400–50; late Middle English dockewede; so called because eaten by ducks
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Duckweed is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
Collins
World English Dictionary
duckweed (ˈdʌkˌwiːd)
 
n
any of various small stemless aquatic plants of the family Lemnaceae, esp any of the genus Lemna, that have rounded leaves and occur floating on still water in temperate regions

Collins English Dictionary - Complete & Unabridged 10th Edition
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