Is there such a word as sud referring to just one of many suds?

looney_tunes

No. Suds is a plural noun that has no singular form. http://www.thefreedictionary.com/suds Mar 14 10, 5:24 AM

Zbeckabee

Sud (noun) : A single bubble of soap or some other bubble-able substance. The singular of the word "suds" (as in "soap suds"). There is one soap "sud" on the table. Of all of the soap suds I see, this is the nicest "sud" of all. http://www3.merriam-webster.com/opendictionary/newword_display_alpha.php?letter=Su&last=20 ONE SUD, TWO SUDS: The president’s beer summit inspired enough groanworthy puns to last us the rest of the year. But as the brew-ha-ha was fading, a radio announcer roused my curiosity with a reference to “one last sud.” Does suds really have a singular? Turns out people have been debating the source of suds for a while. In an 1871 book, “The Origin of Language and Myths,” Morgan Kavanagh claimed it was related to sudor, Latin for “sweat.” Others linked it to seethe, but he argued that such an origin wouldn’t explain its plural form: “Professor Latham’s late edition of Johnson’s dictionary,” which derived suds from seethe, admitted that “there seems no reason {hellip} against saying a sud.” Another 19th century writer, Charles Mackay, claimed suds was based on the Gaelic saod, meaning “state, condition.” Suds’s origins are still not absolutely certain. But the American Heritage Dictionary and other contemporary sources agree that a likely source is “Dutch zudse, marsh, from Middle Dutch sudse.” That would mean that suds began life as a singular, and though it could, like kudos, be reinterpreted as plural and sprout a new singular form, it hasn’t done so yet. http://www.boston.com/bostonglobe/ideas/articles/2009/08/09/vive_la_difference/ Mar 14 10, 6:14 AM