sep·ten·tri·on (sĕp-tĕntrē-ŏn′, -ən)
Northern regions; the north.
[Middle English, from Old French, from Latin septentriōnēs, seven plow oxen, the seven principal stars of Ursa Major or Ursa Minor : septem, seven; see sept in the Appendix of Indo-European roots + triōnēs (pl. of triō, triōn-, plow ox; see terə-1 in the Appendix of Indo-European roots).]
sep·tentri·o·nal (-trē-ə-nəl) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.