phaeophorbide
/ˌfiːə(ʊ)ˈfɔːbʌɪd/(also pheophorbide) Biochemistry
noun
A greyish-green compound formed by the degradation of chlorophyll or phaeophytin (e.g. by strong acid or by enzymes), having the structure of phaeophytin with the phytyl group replaced by a hydrogen atom; (more fully phaeophorbide a, phaeophorbide b) either of two forms of this, derived from chlorophyll a and chlorophyll b respectively.
Origin
Early 20th century; earliest use found in Chemical Abstracts. From German Phäophorbid from ancient Greek ϕαιός grey + ϕορβή pasture, food + German -id.