- a secondary morphological unit, consisting of two monads: a chromosome dyad.
- the double chromosomes resulting from the separation of the four chromatids of a tetrad.
- two persons involved in an ongoing relationship or interaction.
- the relationship or interaction itself.
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Example sentences from the Web for dyad
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.
Perpendicular to the hexad axis are six dyad axes of two kinds and each perpendicular to a vertical plane of symmetry.
They are parallel to the edges of the cube, and in the different classes coincide either with tetrad or dyad axes of symmetry.
Here there is only one dyad axis in which two planes of symmetry intersect.