: existing only as the product of unchecked imagination : fantastically visionary (see visionary entry 1 sense 2) or improbable
chimerical dreams of economic stability
: given to fantastic schemes
She's a chimerical optimist infused with utopian visions.
: relating to, derived from, or being a genetic chimera : containing tissue with two or more genetically distinct populations of cells
Chimeric mice are generated by mixing cells from two embryos, generating a mouse with four parental contributions.—Nancy L. Nadon
: composed of material (such as DNA or polypeptide) from more than one organism
He combined this gene material with safer human DNA and created what's known as a chimeric gene—a gene of antibody instructions that is part man, part mouse.—Eric Hand
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