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There are 4 thirteen-letter words beginning with ULTRAF

ULTRAFAMILIAR	• ultrafamiliar adj. Extremely familiar; particularly familiar. • ULTRAFAMILIAR adj. extremely familiar.
ULTRAFEMININE	• ultrafeminine adj. Highly feminine. • ULTRAFEMININE adj. extremely feminine.
ULTRAFILTERED	• ultrafiltered adj. Filtered using ultrafiltration. • ULTRAFILTER v. to pass through an ultrafilter.
ULTRAFILTRATE	• ultrafiltrate n. The filtrate produced by ultrafiltration. • ultrafiltrate v. To subject to ultrafiltration. • ULTRAFILTRATE n. a substance that has passed through an ultrafilter.

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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English Wiktionary: 11 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 1 word

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