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 There are 11 thirteen-letter words containing I, M, S and 3U| DURALUMINIUMS | • DURALUMINIUM n. a strong, light, aluminium alloy containing copper, also DURAL, DURALUMIN. |  | MULTITUDINOUS | • multitudinous adj. Existing in great numbers; innumerable. • multitudinous adj. Comprising a large number of parts.
 • multitudinous adj. Crowded with many people.
 |  | QUINQUENNIUMS | • quinquenniums n. Plural of quinquennium. • QUINQUENNIUM n. a period of five years, also QUINQUENNIAD.
 |  | RUMBUSTIOUSLY | • rumbustiously adv. In a boisterous or unruly manner. • RUMBUSTIOUS adv. boisterous, rambunctious, also RUMBUSTICAL.
 |  | SUBBITUMINOUS | • subbituminous adj. Partly or imperfectly bituminous. • SUBBITUMINOUS adj. of, relating to, or being coal of lower rank than bituminous coal but higher than lignite.
 |  | TSUTSUGAMUSHI | • tsutsugamushi n. A form of typhus caused by Orientia tsutsugamushi and transmitted by chiggers. • TSUTSUGAMUSHI n. (Japanese) any of various rickettsial disease, including scrub typhus.
 |  | TUMULTUATIONS | • tumultuations n. Plural of tumultuation. • TUMULTUATION n. (archaic) a tumult.
 |  | ULTRALUMINOUS | • ultraluminous adj. Very luminous. |  | UNAMBIGUOUSLY | • unambiguously adv. In a manner that is not ambiguous; leaving no doubt; clearly. • UNAMBIGUOUS adv. not ambiguous.
 |  | UNMISTRUSTFUL | • unmistrustful adj. Not mistrustful. • UNMISTRUSTFUL adj. not mistrustful.
 |  | UNNILQUADIUMS | • UNNILQUADIUM n. a former name of the transuranic element rutherfordium. | 
 Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.Definitions are short excerpt from the WikWik.org and 1Word.ws.
 
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