English pronunciation of “ultra-”

ultra-

uk How to pronounce ultra- prefix in British English
us How to pronounce ultra- prefix in American English
uk How to pronounce ultra- adverb in British English
us How to pronounce ultra- adverb in American English

(English pronunciations of “ultra-” from the Cambridge Advanced Learner’s Dictionary & Thesaurus and from the Cambridge Academic Content Dictionary, both sources © Cambridge University Press)