ultra-
Word family adjectiveultranounultraismultraistprefixultra-
ultra- /ʌltrə/ prefix 1 EXTREMEextremely 极(度) an ultra-modern building 极现代的建筑
He remained ultra-cautious. 他一向极其谨慎。
an ultra-light jacket 极轻的夹克
2 technicalABOVE above and beyond something in a range 外;超 ultrasound (=sound that is too high for humans to hear) 超声(波)
→ infra- Origin ultra- Latin ultra “beyond”, from
ulter;
→ ULTERIOR