Definition of "multi"

multi¹

noun
plural multis
1. (informal, paleontology) A multituberculate.
  Quotations
  Our Mesozoic antecedents are typified by small size; even the largest of the multis are not larger than a groundhog.
  1996, Michael Novacek, Dinosaurs of the Flaming Cliffs, page 316

multi²

noun
plural multies
1. (informal) Neolamprologus multifasciatus (small shell-dwelling cichlid endemic to Lake Tanganyika, popular as aquarium fish)

multi³

noun
uncountable
1. (bridge) A contract bridge convention whereby the opening bid of 2♦ shows several possible types of hands.