Definition of digamma
1 : a letter of the original Greek alphabet representing a sound approximately that of English w which early fell into disuse except in writing the western dialects and in numerical notation where it represented the number 6 —called also vau —symbol F, ϝ
2 : the sound represented by the letter ϝ
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Origin and Etymology of digamma
Latin, from Greek, from di- + gamma; from its resemblance to two capital gammas placed on top of each other
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