- tetracyclic antidepressant,
Origin of tetrad
Examples from the Web for tetrad
In figure 130 one lagging chromosome shows the dyad nature of the products of the division of the tetrad.Studies in Spermatogenesis (Part 1 of 2)|Nettie Maria Stevens
There are five axes of symmetry, one tetrad and two pairs of dyad, each perpendicular to a plane of symmetry.
They are aborting members of the tetrad, and appear to have been used as food by the other spores.Ancient Plants|Marie C. Stopes
They are parallel to the edges of the cube, and in the different classes coincide either with tetrad or dyad axes of symmetry.
During the tetrad division in the basidium nuclear reduction occurs.
Word Origin for tetrad
1650s, from Greek tetras (comb. form tetrad-) "group of four" (see tetra-).