preillumination means illumination prior to some other process. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- Illumination prior to some other process.“The lag period in chlorophyll synthesis can be eliminated by exposing the dark-grown cells to a 2-h preillumination period followed by a 12-h dark period prior to placing them in continuous light for chloroplast development[.]”