noun, plural sigloi
[sig-loi] /ˈsɪg lɔɪ/ (Show IPA)
a silver coin of ancient Persia, the 20th part of a daric.
noun (pl) -loi (-lɔɪ)
a silver coin of ancient Persia worth one twentieth of a daric
noun 1. the 18th letter of the Greek alphabet: Σ, σ, ς. 2. the consonant sound represented by this letter. noun 1. the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S 2. (maths) the symbol Σ, indicating summation of the numbers or quantities indicated sigma sig·ma […]
- Sigma factor
sigma factor n. A protein component of RNA polymerase that determines the specific site on DNA where transcription begins.
noun, Physics. 1. an unstable hyperon having positive, negative, or zero electric charge and strangeness −1. Symbol: Σ.
adjective 1. having the form of the Greek sigma or the letter S. adjective 1. shaped like the Greek letter sigma or the Roman S