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sensitive fern

noun
1.
a common, widely distributed fern, Onoclea sensibilis, having large, triangular leaves and beadlike spikes that contain the spores.
Origin
1805-1815
1805-15, Americanism; so called from the sensitivity of its foliage to frost
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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