vexillology

First attested in 1959. From Latin vexillum (“flag”) +‎ -logy.

• (UK) IPA^(key): /ˌvɛksɪˈlɒlədʒi/
• (US) IPA^(key): /ˌvɛksəˈlɑːlədʒi/

vexillology (uncountable)

1. The study of flags

   Vexillology can help us to delve into national and global history.

   • 2012 January 26, Jim Parsons and Mayim Bialik as Sheldon Cooper and Amy Farrah Fowler, “The Beta Test Initiation”, in The Big Bang Theory‎, season 5, episode 14, 0:18:

     Sheldon: Over the next few 52 weeks, you and I are going to explore the dynamic world of vexillology.

• 2005, Ed. Catherine Soanes and Angus Stevenson, The Oxford Dictionary of English (2nd edition revised), Oxford University Press, →ISBN
• “Vexillology, n.”, in OED Online ⁠, Oxford: Oxford University Press, 1989.
• “vexillology” in Dictionary.com Unabridged, Dictionary.com, LLC, 1995–present.
• “vexillology” in Merriam-Webster's Online Dictionary, © 2008 Merriam-Webster, Incorporated.