chimerical

adj

Etymology: From chimera, from Latin chimaera, from Ancient Greek χίμαιρα (khímaira, “she-goat”). This term entered English in or around 1638.

1. Of or pertaining to a chimera.
2. Being a figment of the imagination; fantastic (in the archaic sense).

   “a chimerical goal”

   “"Yes; I have a turn both for observation and for deduction. The theories which I have expressed there, and which appear to you to be so chimerical, are really extremely practical—so practical that I depend upon them for my bread and cheese."”

3. Inherently fantastic; wildly fanciful.

   “"You are the most charming person in the world. You are invested with a perfect halo of delight," exclaimed Henrietta. "Miss Churchill has some chimerical notion of honour in her head, but that is over now; your information does not leave a single obstacle in the way of the most perfect happiness that ever wound up a fairy tale...”

4. Resulting from the expression of two or more genes that originally coded for separate proteins.
5. Impossible to physically produce due to having an impossibly-high saturation or luminosity, but viewable by overlaying an afterimage and a suitably-colored physical image.