noun:

• weasel (esp. the Japanese weasel, Mustela itatsi)
• mustelid (any other member of the weasel family, incl. badgers, martens, minks, ferrets, otters, polecats, stoats, skunks, etc.)

noun:

• iai; art of drawing one's sword, cutting down one's opponent and sheathing the sword afterwards ➜ 居合い
• iai sword-drawing performance (used during the Edo period to sell medicine and other wares)

prefix:

• surplus- (attaches to start of Sino-Japanese words); excess-; over-
• per- (chemical with more of a certain element than found in other compounds of the same constituents)