The same was compound to kuzdho-zd- which means "sitting (over) a treasure." This also gave the derivative custody which came from the Latin form of http://bartleby.com/images/pronunciation/omacr.gif meaning "guard." Another derivative is kishke coming from the Russian term kishka meaning "gut or sheath." Suffixed extended zero-grade form *kut-no- produced the derivative cunnilingus which came from the Latin term cunnus meaning "vulva or sheath." Another extended root keudh- gave the derivative hide which came from the Old English term http://bartleby.com/images/pronunciation/ymacr.gif dan meaning "to hide or cover up."

Germanic suffixed lengthened zero-grade form http://bartleby.com/images/pronunciation/umacr.gif d-jan, producing the derivative hut, from French term hutte meaning "hut," also from Germanic suffixed zero-grade form http://bartleby.com/images/pronunciation/umacr.gif http://bartleby.com/images/pronunciation/omacr.gif n-. Another derivative is huddle which came from the Low German term hudeln that means "to crowd together," and it may also came from the Germanic term http://bartleby.com/images/pronunciation/ubrevema.gif d-. Lastly, the derivative shieling came from a Scandinavian source that is similar to the Old Norse term http://bartleby.com/images/pronunciation/amacr.gif li, that means "hut" and from the Germanic suffixed o-grade form skaw-ala-. (http://bartleby.com/61/77/S0177700.html)

In other sources, scum was also defined as an extraneous matter or impurities risen to or formed on the surface of a liquid often as a foul filmy covering. This meaning could be compared to a Pond Scum. Another definition is scum as the scoria of metals in a molten state, or scum as a slimy film on a solid or gelatinous object. It could also mean a low, vile...

(http://www.merriam-webster.com/dictionary/scum)
Scum could be found quoted in the following: as a noun, "We're talking scum here. Air should be illegal if they breathe it." [Washington, DC, Policeman. quoted by P.J. O'Rourke in Rolling Stone (New York, 30 Nov. 1989)] and in "We have in the service the scum of the earth as common soldiers." [Arthur Wellesley, 1st Duke Wellington (1769-1852), British soldier, prime minister. Dispatch, July 2, 1813, from Vitoria, Spain, to Lord Bathurst, War Minister. Quoted in Stanhope, Notes of Conversations with the Duke of Wellington (November 4, 1831)]; and as an adjective, "Asking to die: "To die, dear God, before a scum of doubt, Smear the whole universe, and smudge it out." Meanwhile the bees fumbled among the flowers." [Philip Larkin (1922-1986), British poet. "Under a splendid chestnut tree," Columbia Encyclopedia].

Bibliography:

Andrews, Robert; Biggs, Mary; and Seidel, Michael, et al. (1996) "The Columbia World of Quotations" Retrieved November 6, 2006 at http://www.bartleby.com

Douglas Harper (2001). "Online Etymology Dictionary" Retrieved November 6, 2006 from http://www.etymonline.com/index.php?term=scum

Houghton Mifflin Company (2000) "The American Heritage® Dictionary of the English

Language," 4th Ed., Retrived November 6, 2006 at http://bartleby.com/61/77/S0177700.html

AskOxford, com" (2006). Retrieved November 6, 2006 at http://www.askoxford.com/concise_oed

Merriam-Webster Online" (2006) Retrieved November 6, 2006 at http://www.merriam-webster.com/dictionary