Definition of keyaki in US English:

keyaki

(also kiaki, kiyaki)

noun

  • A deciduous tree, Zelkova serrata (family Ulmaceae), native to Japan and other parts of eastern Asia, commonly planted as a shade tree and formerly for timber.

Origin

Mid 19th century. From Japanese keyaki, (regional) kiyaki, kiyake from a first element of uncertain origin, perhaps keya conspicuous, different (on account of the unusual grain of its wood; from ke other, strange) + -ki tree.