ICTERICAL


icterical: tinged with yellow
It sounds like rectangle's long lost geometric cousin, but nope. It's not even a grammatical term, either, which would have been my next guess. No, this odd little term describes a color--or rather, something touched by a color. In this case, the color yellow.
As it happens, there are a ton of color-related obscure terms that I'd love to do something with sometime. Maybe I'll collect them into similar hues, like reds or blues.