- (specialist)
something that consists of two parts 二分体；二联体 the mother-child dyad 母子二分体
- (
mathematics 数学 an operator that is the combination of two vectors 并矢
Word Originlate 17th cent. (originally denoting the number two or a pair): from late Latin dyas, dyad-, from Greek duas, from duo ‘two’. Current senses date from the late 19th cent.