For what it's worth: Oberon Zell-Ravenheart has indicated that "polyamory" was originally thought of as a word that denotes "many lovers" in the same way that "polygamy" denotes "many spouses." I've heard polyamory defined as anything from "fully egalitarian, ethical, sexual, romantic multiple relationships" to "any type of love at all." It's hard to get agreement on the definition, so depending on how you define the word, you could say that virtually everyone is "polyamorous."
Wiktionary defines polyamory as: "any of various practices involving romantic or sexual relationships with multiple partners with the knowledge and consent of all involved."
It defines polyamorous as:
"following one of various practices of having relationships with multiple partners, with the knowledge and consent of all involved," or,
"having personal beliefs regarding relationships that are compatible with polyamory, regardless of one's experience or current practices."
Wikipedia defines polyamory as: "the practice, desire, or acceptance of having more than one intimate relationship at a time with the knowledge and consent of everyone involved."
It doesn't give a specific definition for "polyamorous."
Love means never having to say, "Put down that meat cleaver!"