[John Isbell]

Robert Francis's appended definitions ("deasil: from east to west") mislead a bit, as David notes. Cf. this online Irish dictionary: "Right-handed, left-handed, screw: scriú deisil, tuathail." The OED spells it deasil.
He's closer on widdershins, which it spells withershins and which is not left-handed. This online definition will do: "in a direction contrary to the sun's course, considered as unlucky; counterclockwise."
The OED lacks cancrizans: "A musical line which is the reverse of a previously or simultaneously stated line is said to be its retrograde or cancrizans".

Brian, all I know is that Monet painted nympheas. Nenuphars I see are similar but distinct, like a mouette and a goeland.

Cheers,
John

P.S. Aaron, that is a wild ride. The word apricot has a great history as well, from the Latin praecox via the Arabic before returning to Romance.
Update: here's a brief online summary - "mid 16th century: from Portuguese albricoque or Spanish albaricoque, from Spanish Arabic al ‘the’ + barḳūḳ (from late Greek praikokion, from Latin praecoquum, variant of praecox ‘early ripe’); influenced by Latin apricus ‘ripe’ and by French abricot ."