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semidouble

[sem-ee-duhb-uh l, sem-ahy-]
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adjective Botany.
  1. having more petals than those of a single flower but fewer than those of a double flower.
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Origin of semidouble

First recorded in 1970–75; semi- + double
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018