Having a valence of one; capable of combining with, or of being substituted for, one atom of hydrogen; monovalent; -- said of certain atoms and radicals.

monovalent. See valence, unloader. Same as a circulation valve

having a valence of 1

An unpaired chromosome in meiosis.

An unpaired chromosome at meiosis.

used of a chromosome that is not paired or united with its homologous chromosome during synapsis; "a univalent chromosome"