Unfamiliar words, places, and sundry other references get added to the list with a view toward richer cultural and conversational engagement.

Recently Erased Ignorance
Ignorance Explained
1 mellifluous (of a voice or words) sweet or musical; pleasant to hear: the voice was mellifluous and smooth.
2 frisson a sudden strong feeling of excitement or fear; a thrill
3 churlish rude in a mean-spirited and surly way
4 cognomen nickname
5 descant a discourse on a theme or subject
6 lenity synonym (usage appears archaic) for leniency
7 inveigle gain entrance to (a place) by persuading (someone) with deception or flattery
8 crepuscular that which is related to twilight
9 trammel to catch as with a net, or confine
10 byre a cow barn (British)

The full list can be viewed here.

Definitions appearing on this page are generally either verbatim or derived from Merriam-Webster's College Dictionary, Tenth Edition, 1999 or its online counterpart.