Sanskrit

Noun

दोस् • ‎(dos) n

1. (m. only R. vi, 1, 3 ; nom. acc. sg. दोस् ṠBr. ; du. दोषी Kauṡ. ; दोर्भ्याम् n. MBh. Kāv. ; pl. °भिस् Mālav. ; दोह्षु BhP.) the forearm, the arm etc. = दोषन् (q.v.)
2. the part of an are defining its sine.
3. the side of a triangle or square. (compare बाहु and भुज).

References

• Monier William's Sanskrit-English Dictionary, 2nd Ed. 1899