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Latin word monstro comes from Latin moneo (I remind. I warn, advise.)
moneo (Latin)
I remind. I warn, advise.
monstrum (Latin)
(figuratively) a thing that evokes fear and wonder. (metonymically) a monster, monstrosity, whether in size or character. A divine omen indicating misfortune, an evil omen, portent.
monstro (Latin)
I advise, teach. I appoint, ordain.. I denounce, indict.. I show, point out, indicate.