(of a flower) having four stamens in two pairs of different length.

1785–95; < Neo-Latin Didynam(ia) name of the class (equivalent to di- di-1 + Greek dýnam(is) power (see dynamic) + -ia -ia) + -ous

didynamy, noun
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World English Dictionary
didynamous (daɪˈdɪnəməs)
(of plants) having four stamens arranged in two pairs of unequal length, as in the foxglove
[C18: from New Latin Didynamia name of former class, from di-1 + Greek dunamis power, referring to the greater strength of the two long stamens]

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