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[pen-tam-er-uh s]
See more synonyms for pentamerous on Thesaurus.com
  1. consisting of or divided into five parts.
  2. Botany. (of flowers) having five members in each whorl.
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Origin of pentamerous

From the New Latin word pentamerus, dating back to 1820–30. See penta-, -merous
Related formspen·tam·er·ism, pen·tam·er·y, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for pentamerous

Historical Examples

  • Pentamerous insects are those which have five joints in all their tarsi.

    An Introduction to Entomology: Vol. III (of 4)

    William Kirby

  • Thus, in both Lilium lancifolium and L. auratum the writer has frequently met with pentamerous flowers.

    Vegetable Teratology

    Maxwell T. Masters

  • The Clerid, which M. Latreille has placed in the pentamerous section, vary considerably in the number of their tarsal joints.

  • To take an example, the group Pseudostrobus, characterized by pentamerous leaf-fascicles, appears in many systems.

    The Genus Pinus

    George Russell Shaw

  • Thus fig. 38 shows a pentamerous symmetrical flower, with dimerous pistil.

British Dictionary definitions for pentamerous


  1. consisting of five parts, esp (of flowers) having the petals, sepals, and other parts arranged in groups of five
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Derived Formspentamerism, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012