|Definition - A word that has been created from a verb but which don't function as a verb in a sentence.|
Some types of verbals are:
(1) gerunds (the ing form of a verb used as a noun, e.g. living well is the best revenge.
(2) infinitives (the uninflected form of a verb, e.g. to be or not to be.)
(3) participles (verbs used as modifiers, e.g. a dancing fool.)
Etymology - The word ultimately derives from the Latin verbalis, consisting of words or pertaining to verbs (from verbum, word).
Oxford English Dictionary - Its first citation is from 1530:
"Broderésse, a woman brodurar, … tenceresse, a woman chyder; and so of all other verballes."
(Jehan Palsgrave, Lesclarcissement de la langue françoyse, 154)