D defs.my
Entry 1 sense Webster, 1913

Perissad

· Per·is·sad · IPA
01 a. Odd; not even; -- said of elementary substances and of radicals whose valence is not divisible by two without a remainder. Contrasted with…
  1. 1.
    Odd; not even; -- said of elementary substances and of radicals whose valence is not divisible by two without a remainder. Contrasted with artiad.(Chem.) [Archaic]