di·gam·ma
| \ dīˈgamə, ˈdīˌg- \
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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Merriam-Webster unabridged
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