sigma(Greek: the eighteenth letter of the Greek alphabet)sigma
1. The 18th letter of the Greek alphabet, represented in the English alphabet as "s".
2. The symbol (σ) indicating the addition of the numbers or quantities indicated. sigma factor
A protein component of RNA polymerase that determines the specific site on DNA where transcription begins.
sigmate
Having the form of the Greek sigma or the letter "S".
sigmatism
Incorrect, difficult, or the too frequent use of the "s" sound.
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