dumb plant

dumb cane

noun
a West Indian foliage plant, Dieffenbachia seguine, of the arum family, having yellow-blotched leaves that cause temporary speechlessness when chewed.
Also called dumb plant, mother-in-law plant.


Origin:
1690–1700

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
dumb cane

noun
an evergreen plant with large showy dark green leaves; contains a poison that swells the tongue and throat hence the name 
WordNet® 3.0, © 2006 by Princeton University.
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