viridian (pg. 1) -- A chrome green pigment that is a hydrated oxide of chromium.
Zoi (pg. 2) -- Probably an invented term, refers to an object of power. Possibly inspired by borzoi dogs?
effulgence (pg. 2) -- A state of being bright and radiant, splendor, brilliance..
eughky (pg. 12) -- "I still have dry and (a very technical term) eughky ends" from http://www.archive.longhaircommunity.com/showthread.php?t=70034
sloven (pg. 18) -- A coarse obnoxious person.
quaint and knowing (pg. 52) -- Marked by beauty or elegance. I figured the author was using a different meaning!
sluttish (pg. 54) -- A saucy girl. Yet another different meaning..
couchant (pg. 129) -- Lying on the stomach with head raised with legs pointed forward.
empyrean (pg. 255) -- Of or relating to the sky or heavens.
Melpomene (pg. 260) -- The Muse of tragedy.
He remembered that his Companion had tried to use the Zoi on him. (pg. 169) Wait, what??