For instance, they referred to justice as the (tetrad, or) groupoffour,12 and likewise for everything else.
There are five axes of symmetry, one tetrad and two pairs of dyad, each perpendicular to a plane of symmetry.
The four cocci which result from a single division may remain together, giving the tetracoccus or tetrad grouping.
The elements of symmetry are a tetrad axis with a plane perpendicular to it, and a centre of symmetry.
Having sent for that Brhman, he learnt from him a tetrad of gths.
In figure 130 one lagging chromosome shows the dyad nature of the products of the division of the tetrad.
During the tetrad division in the basidium nuclear reduction occurs.
They are parallel to the edges of the cube, and in the different classes coincide either with tetrad or dyad axes of symmetry.
Such an axis of symmetry is known as a tetrad axis of symmetry.
The tetrad for the perfect figure—the cube, length, depth, and width.
1650s, from Greek tetras (comb. form tetrad) "group of four" (see tetra).
tetrad tet·rad (tět'rād')
n.
A group or set of four.
A tetravalent atom, radical, or element.
A group of four chromatids formed from each of a pair of homologous chromosomes that split longitudinally during the prophase of meiosis.
tetrad (tět'rād')
