[dahy-gam-uh] 
| a letter of the early Greek alphabet that generally fell into disuse in Attic Greek before the classical period and that represented a sound similar to English w. |
| di·gam·ma (dī-gām'ə) n. A letter occurring in certain early forms of Greek and transliterated in English as w. [Latin, from Greek : di-, two; see di-1 + gamma, gamma (because its shape resembles two gammas); see gamma.] |
ə