dyad

 
Pronunciation: /ˈdʌɪad/

noun

technical
  • something that consists of two elements or parts.
  • Mathematics an operator which is a combination of two vectors.

Derivatives

dyadic

Pronunciation: /-ˈadɪk/
adjective

Origin:

late 17th century (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 century