资料来源 : Webster's Revised Unabridged Dictionary (1913)

Tanka \Tan"ka\, n. (Naut.)
   A kind of boat used in Canton. It is about 25 feet long and
   is often rowed by women. Called also {tankia}. --S. W.
   Williams.

资料来源 : WordNet®

tanka
     n 1: a form of Japanese poetry; the 1st and 3rd lines have five
          syllables and the 2nd, 4th, and 5th have seven syllables
     2: a Tibetan religious painting on fabric