sig·ma (s g m )n. 1. The 18th letter of the Greek alphabet. See Table at alphabet. 2. A sigma factor. 3. A sigma baryon. [Greek s  gma, of Phoenician origin; see smk in Semitic roots.]sig mate (-m t) adj. |
sigmate [ˈsɪgmɪt -meɪt]
adj
shaped like the Greek letter sigma or the Roman S
sigmation [sɪgˈmeɪʃən] n
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