• Webster's Revised Unabridged Dictionary
    • n. pl Tetradynamia (Bot) A Linnæan class of plants having six stamens, four of which are longer than the others.
    • ***
Century Dictionary and Cyclopedia
    • tetradynamia The fifteenth class in the Linnean system, comprehending those plants which bear hermaphrodite flowers with six stamens, four of them longer than the other two. It was divided into 2 orders—Siliculosa, of which the common garden-cress and shepherd's-purse are examples, and Siliquosa, of which the mustard and cabbage are examples. All the plants of this class are now included in the natural order Cruciferæ.
    • ***


Webster's Revised Unabridged Dictionary
NL., fr. Gr. te`tra-see Tetra-) + power


In literature:

Sydenham recommends vegetables of the class Tetradynamia in rheumatic pains left after the cure of intermittents.
"Zoonomia, Vol. II" by Erasmus Darwin