sil

noun1

1. •
   A yellowish pigment used by painters in ancient times.

   • Indeed, Vitruvius and Pliny the Elder attest that in Greece ochra was the name of the yellow quality, corresponding to what the Romans called sil. — 2017

noun3

1. •
   Initialism of sibling-in-law.
2. •
   Initialism of sister-in-law.
3. •
   Initialism of safety integrity level.