n. 希腊字母第19字

[ noun ]
the 19th letter of the Greek alphabet
<noun.communication>

Tau \Tau\ (tou), n. [Gr. tay^.]
The nineteenth letter ([Tau], [tau]) of the Greek alphabet,
equivalent to English t.
[Webster 1913 Suppl.]


Tau \Tau\, n. [Gr. tay^ the letter [tau] (English {T}).]
(Zo["o]l.)
The common American toadfish; -- so called from a marking
resembling the Greek letter tau ([tau]).

{Tau cross}. See Illust. 6, of {Cross}.