sercë ("k")noun "blood" _(SA:sereg, PE17:184; the Etymologies gives _yár as the Quenya word for "blood")
Quenya
sercë
noun. blood
sercë
blood
yár
blood
yár (yar-, as in dat.sg. yaren) noun "blood"_ (YAR; the Silmarillion appendix gives _sercë instead. According to VT46:22, Tolkien introduced yór_ as a replacement form in the Etymologies itself.)_
yór
blood
yór noun "blood"; see yár (VT46:22)
A noun for “blood” appearing in Quenya Notes (QN) from 1957 derived from the root √SEREK of the same meaning (PE17/185). It appeared as an element in the word serkilixa “blood-thirsty” from 1968 (NM/176), indicating a stem form of serci-.