teˈtramerismn. the condition of being tetramerous; division into four parts or into sets of four.
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the world > relative properties > number > specific numbers > four > [noun] > division into four
quadrature1578
quadripartitiona1661
quadrisection1673
quadripartiting1702
tetrachotomy1858
tetramerism1888
1888 Amer. Naturalist22 941 The morphological significance of the primary subdivision into four or tetramerism of the germ-bands of Stenobothrus and Œcanthus.