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There are 11 words beginning with PHTHA

PHTHALATE	• phthalate n. (Organic chemistry) Any salt or ester of a phthalic acid. • PHTHALATE n. a salt of phthalic acid.
PHTHALATES	• phthalates n. Plural of phthalate. • PHTHALATE n. a salt of phthalic acid.
PHTHALEIN	• phthalein n. (Organic chemistry) any of a range of lactones formed by the reaction of phenols with phthalic anhydride. • PHTHALEIN n. any one of a very important class of dye-yielding materials formed by the union of phenols with phthalic anhydride.
PHTHALEINS	• phthaleins n. Plural of phthalein. • PHTHALEIN n. any one of a very important class of dye-yielding materials formed by the union of phenols with phthalic anhydride.
PHTHALIC	• phthalic adj. (Chemistry) of, relating to, or derived from naphthalene or phthalic acid. • PHTHALIC adj. pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances.
PHTHALIN	• phthalin n. (Chemistry) A colourless crystalline substance obtained by reduction from phthalein, into which it is… • phthalin n. (Chemistry) Any of the series of which phthalin proper is the type. • PHTHALIN n. a colourless crystalline compound obtained by reducing a phthalein.
PHTHALINS	• phthalins n. Plural of phthalin. • PHTHALIN n. a colourless crystalline compound obtained by reducing a phthalein.
PHTHALOCYANIN	• phthalocyanin n. Alternative form of phthalocyanine. • PHTHALOCYANIN n. any of a group of green and blue organic colouring matters of great fastness and brilliance, also PHTHALOCYANINE.
PHTHALOCYANINE	• phthalocyanine n. (Organic chemistry) Any of a family of macrocyclic compounds having a structure similar to that of porphyrin;… • PHTHALOCYANINE n. any of a group of green and blue organic colouring matters of great fastness and brilliance, also PHTHALOCYANIN.
PHTHALOCYANINES	• phthalocyanines n. Plural of phthalocyanine. • PHTHALOCYANINE n. any of a group of green and blue organic colouring matters of great fastness and brilliance, also PHTHALOCYANIN.
PHTHALOCYANINS	• phthalocyanins n. Plural of phthalocyanin. • PHTHALOCYANIN n. any of a group of green and blue organic colouring matters of great fastness and brilliance, also PHTHALOCYANINE.

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: 49 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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