nonorange en · ADJ
Etymology
From non- + orange.
Meanings
-
(not-comparable) Not orange.
The orange allele (O) is co-dominant with nonorange (o). Thus, cats with a mosaic coat of both orange and nonorange (Oo) must have two X chromosomes, which means tortoiseshell cats are almost always female.
2021, Lowell Ackerman, Pet-Specific Care for the Veterinary Team, page 238: