Definition of ultra- prefix from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈʌltrə//
; NAmE NAmE//ˈʌltrə//
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(in adjectives and nouns) extremely; beyond a particular limit ultra-modern ultraviolet compare infra- More Like This Prefixes a-, ante-, anti-, be-, co-, de-, demi-, dis-, en-, ex-, extra-, hyper-, hypo-, il-, in-, infra-, inter-, intra-, mis-, non-, off-, oft-, out-, over-, para-, post-, pre-, pro-, re-, retro-, semi-, sub-, trans-, ultra-, un-, under-, up-See worksheet. Word Originfrom Latin ultra ‘beyond’.
See the Oxford Advanced American Dictionary entry: ultra-