Source : Webster's Revised Unabridged Dictionary (1913)

Tael \Tael\, n. [Malay ta?l, a certain weight, probably fr.
   Hind. tola, Skr. tul[=a] a balance, weight, tul to weigh.]
   A denomination of money, in China, worth nearly six shillings
   sterling, or about a dollar and forty cents; also, a weight
   of one ounce and a third. [Written also {tale}.]

Source : WordNet®

tael
     n : a unit of weight used in east Asia approximately equal to
         1.3 ounces