MONACID
Mon*ac"id, a. Etym: [Mon- + acid.] (Chem.)
Defn: Having one hydrogen atom replaceable by a negative or acid atom or radical; capable of neutralizing a monobasic acid; — said of bases, and of certain metals.
MONAD
Mon"ad, n. Etym: [L. monas, -adis, a unit, Gr.
1. An ultimate atom, or simple, unextended point; something ultimate and indivisible.
2. (Philos. of Leibnitz)
Defn: The elementary and indestructible units which were conceived of as endowed with the power to produce all the changes they undergo, and thus determine all physical and spiritual phenomena.
3. (Zoöl.)
Defn: One of the smallest flangellate Infusoria; esp., the species of the genus Monas, and allied genera.
4. (Biol.)
Defn: A simple, minute organism; a primary cell, germ, or plastid.