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pleiotaxy

or plei·o·tax·is

[plahy-uh-tak-see]
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noun Botany.
  1. an increase in the normal number of parts.

Origin of pleiotaxy

First recorded in 1885–90; pleio- + -taxy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018