Definition of monoid in English:

monoid

Pronunciation /ˈmɒnɔɪd/

noun

Mathematics
  • 1rare A surface which possesses a conical point of the highest possible order (i.e. n − 1, where n is the order of the equation defining the surface).

  • 2A semigroup possessing an identity element.

Origin

Mid 19th century (in an earlier sense). From mono- + -oid.