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 There are 4 fifteen-letter words beginning with ULTRAMI| ULTRAMICROMETER | • ultramicrometer n. A very precise micrometer. • ULTRAMICROMETER n. a micrometer for measuring extremely small distances.
 |  | ULTRAMICROSCOPE | • ultramicroscope n. A microscope that uses bright illumination against a black background to view small particles. • ULTRAMICROSCOPE n. an instrument for viewing extremely small objects.
 |  | ULTRAMICROSCOPY | • ultramicroscopy n. The scientific use of the ultramicroscope. • ULTRAMICROSCOPY n. microscopy using an ultramicroscope.
 |  | ULTRAMICROTOMES | • ultramicrotomes n. Plural of ultramicrotome. • ULTRAMICROTOME n. a microtome for cutting extremely thin sections for electron microscopy.
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 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.
 
 See this list for:English Wiktionary: 11 wordsScrabble in French: 1 wordScrabble in Spanish: no wordScrabble in Italian: 3 wordsScrabble in German: no wordScrabble in Romanian: 2 words
 
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