( often initial capital letter ) a mythological, fire-breathing monster, commonly represented with a lion's head, a goat's body, and a serpent's tail.

any similarly grotesque monster having disparate parts, esp. as depicted in decorative art.

a horrible or unreal creature of the imagination; a vain or idle fancy

He is far different from the chimera your fears have made of him.

Genetics . an organism composed of two or more genetically distinct tissues, as an organism that is partly male and partly female, or an artificially produced individual having tissues of several species.

noun

reality , truth

noun

bogy , bubble , delusion , fabrication , fancy , fata morgana , figment , fool’s paradise , hallucination , ignis fatuus , illusion , mirage , monster , monstrosity , pipe dream * , rainbow * , snare , specter , virtual reality , castle in the air , dream , fantasy , pipe dream , rainbow , phantom