How to use Tetrad in a sentence
The data are only fully comprehensive at the 10-km square level and not at the tetrad level.
Most have proved to be new tetrad records and some have been new to that ten km square.
Those elements which are equivalent in combining or displacing power to a single atom of hydrogen are said to be univalent or monad elements; whilst those which are equivalent to two atoms of hydrogen are termed bivalent or dyad elements; and those equivalent to three, four, five or six atoms of hydrogen triad, tetrad, pentad or hexad elements.
Figures in italics are derived from the tetrad survey.
Many counties have published tetrad distribution maps of various groups - Worcestershire none.Advertisement
The atlas is provided with tetrad maps produced by the Records Center.
The sporogenous tissue, which is referable to several archesporial cells, is surrounded by a tapetum, mostly derived from the sporogenous group. In the microsporangium all the mother-cells undergo the tetrad division, giving rise to the numerous microspores.
This new unity firmly established the "narcoleptic tetrad" as the definitive diagnostic criteria for narcolepsy.