backswimmer

back·swim·mer

[bak-swim-er]
noun
any of numerous predaceous aquatic hemipterous insects, of the family Notonectidae, that swim on their backs, and may inflict a painful bite if handled.
Also called boat bug.


Origin:
1860–65; back1 + swimmer

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
backswimmer

noun
predaceous aquatic insect that swims on its back and may inflict painful bites 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Backswimmer 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.
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