Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Unusual regularity in the form of a flower that is normally irregular.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. abnormal regularity; the state of certain flowers, which, being naturally irregular, have become regular through a symmetrical repetition of the special irregularity

from the GNU version of the Collaborative International Dictionary of English

  • n. Abnormal regularity; the state of certain flowers, which, being naturally irregular, have become regular through a symmetrical repetition of the special irregularity.

from The Century Dictionary and Cyclopedia

  • n. In botany, the appearance of regularity of structure in the flowers of plants which normally bear irregular flowers.

Etymologies

New Latin, from Greek pelōros, monstrous, from pelōr, monster; see kwer- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek πέλωρ (pelōr, "monster"). (Wiktionary)

Examples

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  • We know, at least, that with irregular flowers those nearest to the axis are most subject to peloria, that is to become abnormally symmetrical.
    Origin of Species, ch. 5

    In the glossary Darwin gives:

    PELORIA or PELORISM.—The appearance of regularity of structure in the flowers of plants which normally bear irregular flowers.

    February 17, 2009