Where does “serosanguinolent” come from?

serosanguinolent (English) comes from English sanguinolent, from Middle English sanguinolent, from Old French sanguinolent, from Latin sanguinolentus, from Latin -olentus, from Latin -entus, from Latin cruentus, from Latin cruor — blood outside the body.

Ancestry of “serosanguinolent”, step by step

StepLanguageWordMeaning
1EnglishsanguinolentContaining or tinged with blood
2Middle EnglishsanguinolentEmitting blood or having blood flow out;...
3Old Frenchsanguinolent
4Latinsanguinolentusfull of blood, bloody, sanguinary; bloodred
5Latin-olentusadjective-forming suffix meaning abounding in,...
6Latin-entusadjective-forming suffix meaning abounding in,...
7Latincruentusbloody in its various senses, "particularly:"
8Latincruorblood, gore; murder, bloodshed
9Proto-Indo-Europeankrewh₂-blood outside the body
Every word from Proto-Indo-European krewh₂-Every word from Latin -entusEvery word from Latin -olentus