Word of the Day -- Welkin

Today's word is just one of those words I imagine will fit well into an adventure on day.  It's just got that nice ring to it, and when you read the definition, it just screams, "put me in Castles & Crusades!".  It is defined as: the vault of the sky : firmament.  There's just something nice in tone and manner of that definition, vault of the sky.  I just like saying it. 

When it comes to "welkin," the sky's the limit. This heavenly word has been used in English to refer to the vault of the sky since at least the 12th century, and it derives from an earlier word from Old English that meant "cloud." In current English, "welkin" is still flying high, and it is often teamed with the verb "ring" to suggest a loud noise or an exuberant expression of emotion, as in "the welkin rang with the sound of the orchestra" or "her hearty laugh made the welkin ring." These contemporary phrases echo an older use—the original words of a carol that once began "Hark, how all the welkin ring," which we now know as "Hark! The herald angels sing."