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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.]


(Letters of the Alphabet (Foreign)) a letter of the Greek alphabet (Ϝ) that became obsolete before the classical period of the language. It represented a semivowel like English W and was used as a numeral in later stages of written Greek, and passed into the Roman alphabet as F
[C17: via Latin from Greek, from di-1 + gamma; from its shape, which suggests one gamma upon another]


(daɪˈgæm ə)

n., pl. -mas.
a letter of the early Greek alphabet that represented a sound similar to English w and fell into disuse before the classical period.
[1545–55; < Latin < Greek dígamma]
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References in classic literature ?
1) In diction, dialect and style it is obviously dependent upon Homer, and is therefore considerably later than the "Iliad" and "Odyssey": moreover, as we have seen, it is in revolt against the romantic school, already grown decadent, and while the digamma is still living, it is obviously growing weak, and is by no means uniformly effective.
Merkle, Convexity, Schur-convexity and bounds for the gamma function involving the digamma function, Rocky Mountain J.
An available structured light mode allows for one-to-one mapping of the input data to the micromirrors, and pattern rates up to 4225 Hz per second (up to 120 Hz with 24-, 27-, and 30-bit RGB patterns), while a video projection mode offers programmable color adjustment, color space conversion, and digamma.
L'harpax de Therapne ou le digamma d'Helene: 0:130(ovfic xapax-rfip cam*.
as well, where [PSI](n, x) is the nth polygamma function, which is the nth derivative of the digamma function, [PSI](x) := (ln([GAMMA](x)))'= [GAMMA]'(x)/[GAMMA](x).
The numeral-signs are the 24 familiar letters of the Greek alphabet, plus three archaic or foreign signs called episemons: vau or digamma (6), qoppa (90) and san or sampi (900).
where [Psi](w) = d/dw log [Gamma](w) is the digamma function.
Littera digamma restituta ad metri leges redegit, et notatione brevi illustravit T.
She was named "Broadcaster of the Year" at the DiGamma Kappa Broadcast Pioneer Award Dinner at the University of Georgia for the Henry W.
The digamma (or psi) function is defined for positive real numbers x as the logarithmic derivative of Euler's gamma function, that is [psi](x) = d/dx ln[GAMMA](x) = [GAMMA]'(x)/[GAMMA](x).
Additionally, there are 6 letters that appear in earlier versions of the Greek alphabet: digamma, episemon, koppa, sampi, san and vau.
Provides introductory material to required mathematical topics such as complex numbers, Laplace and Fourier transforms, matrix algebra, confluent hypergeometric functions, digamma functions, and Bessel functions.