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There are 13 words beginning with SIGMA

SIGMA	• sigma n. The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient. • sigma n. (Mathematics) The symbol Σ, used to indicate summation of a set or series. • sigma n. (Statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a…
SIGMAS	• sigmas n. Plural of sigma. • SIGMA n. (Greek) the Greek letter S.
SIGMATE	• sigmate adj. Shaped like the Greek letter sigma. • sigmate v. (Transitive, grammar) To modify (a Greek word) by adding sigma, or by changing another letter to sigma. • SIGMATE adj. S-shaped, also SIGMATED, SIGMOID, SIGMOIDAL.
SIGMATED	• sigmated v. Simple past tense and past participle of sigmate. • SIGMATE v. to add a sign to.
SIGMATES	• sigmates v. Third-person singular simple present indicative form of sigmate. • SIGMATE v. to add a sign to.
SIGMATIC	• sigmatic adj. (Linguistics) Having the consonant s added to the root in order to form a tense or case stem. • sigmatic adj. Relating to sigmatics. • SIGMATIC adj. characterized by a sign.
SIGMATING	• sigmating v. Present participle of sigmate. • SIGMATE v. to add a sign to.
SIGMATION	• sigmation n. (Grammar) The process of sigmating; addition of a sigma. • SIGMATION n. the addition of a sigma at the end of a syllable.
SIGMATIONS	• SIGMATION n. the addition of a sigma at the end of a syllable.
SIGMATISM	• sigmatism n. A lisp. • sigmatism n. Defective pronunciation of sibilant sounds. • SIGMATISM n. repetition of the sigma sound.
SIGMATISMS	• sigmatisms n. Plural of sigmatism. • SIGMATISM n. repetition of the sigma sound.
SIGMATRON	• SIGMATRON n. a machine generating high-potential X-rays.
SIGMATRONS	• SIGMATRON n. a machine generating high-potential X-rays.

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: 28 words
Scrabble in French: 2 words
Scrabble in Spanish: 2 words
Scrabble in Italian: 7 words
Scrabble in German: 2 words
Scrabble in Romanian: 15 words

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