ultrahigh


ul·tra·high

U0010500 (ŭl′trə-hī′)adj. Exceedingly high: an ultrahigh vacuum.

ultrahigh

(ˌʌltrəˈhaɪ) adjextremely high

ul•tra•high

(ˌʌl trəˈhaɪ)

adj. extremely high. [1945–50]