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There are 7 twelve-letter words containing IPHTH

DIPHTHERITIC	• diphtheritic adj. (Medicine) Resembling or related to diphtheria. • DIPHTHERITIC adj. relating to diphtheria.
DIPHTHERITIS	• diphtheritis n. (Dated) diphtheria. • DIPHTHERITIS n. diphtheria.
DIPHTHEROIDS	• diphtheroids n. Plural of diphtheroid. • DIPHTHEROID n. a bacterium that resembles the bacterium of diphtheria but does not produce diphtheria toxin.
DIPHTHONGING	• DIPHTHONG v. to pronounce as a diphthong.
DIPHTHONGISE	• diphthongise v. Alternative spelling of diphthongize. • DIPHTHONGISE v. to make into a diphthong, also DIPHTHONGIZE.
DIPHTHONGIZE	• diphthongize v. (Transitive, phonetics) To change to a diphthong, as by inserting or removing a vowel. • diphthongize v. (Intransitive, phonetics) To become a diphthong. • DIPHTHONGIZE v. to make into a diphthong, also DIPHTHONGISE.
TRIPHTHONGAL	• triphthongal adj. Pertaining to a triphthong. • TRIPHTHONGAL adj. relating to triphthong.

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: 9 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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