peri		in Persian mythology, one of a race descended from fallen angels, represented as beautiful and graceful.
hebetate		to dull or blunt, often figuratively. also v.i., adj.
abulia		(psychiat.) a lack of volition.
cacoe"thes		an irresistible urge.
nona		lethargic encephalitis.
velleity		a wish without any effort to obtain its end.
sciamachy		fighting a shadow.
ullage		the amount by which a container fails to be full; the volume remaining in a container which has been partly emptied; (rocketry) the space left in a propellant tank for expansion, offgassing, etc.
tare		the weight of a container or conveyance; to account for this in the gross weight.
agio		allowance made for the differing values of currencies.
tret		allowance for wastage.