The story
Blend of skin + rainbow, coined in 2016 in a paper by C. H. Chen et al, Multicolor Cell Barcoding Technology for Long-Term Surveillance of Epithelial Regeneration in Zebrafish.
Etymology from Wiktionary, CC BY-SA 4.0.
skinbow
Today it means: Of a zebrafish: having been genetically engineered to have a skin of many colours, to aid in the visualization of changes in its cells. Full definition →