M0186400 (mĭ-dä′kə)n. A small Japanese fish (Oryzias latipes) that is commonly found in rice paddies and is often used in biological research or in stocking aquariums.[Japanese : me, eye + -daka, combining form of taka-, stem of takai, high (in reference to its large, protuberant eyes).]
me•da•ka
(mɪˈdæk ə)
n., pl. -kas. a small Japanese fish, Oryzias latipes, often kept in aquariums. [1930–35; < Japanese]