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Webster 1913 Edition

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Noun.

pl.

[NL., fr. Gr.

πολύσ

many + [GREEK] brother.]

(Bot.)

A Linnæan class of plants having stamens united in three or more bodies or bundles by the filaments.

polyadelphia ‎(plural polyadelphias)

(obsolete) A former taxonomic class of plants having the stamens united by their filaments into bundles