Idol (n.) An image or representation of anything.

Idol (n.) An image of a divinity; a representation or symbol of a deity or any other being or thing, made or used as an object of worship; a similitude of a false god.

Idol (n.) That on which the affections are strongly (often excessively) set; an object of passionate devotion; a person or thing greatly loved or adored.

Idol (n.) A false notion or conception; a fallacy.