of or relating to an element consisting of a single atom; "helium and argon are monatomic gases"
Same as Univalent.
Containing but 1 atom of replaceable hydrogen.
Having a combining capacity that is saturated by union with 1 atom of hydrogen.
Formed by replacing 1 atom of hydrogen in a hydrocarbon by 1 molecule of hydroxyl. See monohydric. [Gr.]