(chemistry, of a molecule etc.) Consisting of two atoms.

(chemistry) A diatomic molecule or other species

(rare) Of or relating to diatoms.

plural of diatomic

Involving two atoms.

The quality of being diatomic.

(mineralogy) Having a single, distinct, diagonal cleavage; said of crystals.

Any of a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class Diatomophyceae or division Bacillariophyta.

plural of diatom