[1965–70; ultra- + clean]This word is first recorded in the period 1965–70. Other words that entered Englishat around the same time include: double-book, hired gun, red-eye, stun gun, wraparoundultra- is a prefix occurring originally in loanwords from Latin, with the basic meaning“on the far side of, beyond.” In relation to the base to which it is prefixed, ultra- has the senses “located beyond, on the far side of” (ultramontane; ultraviolet), “carrying to the furthest degree possible, on the fringe of” (ultraleft; ultramodern), “extremely” (ultralight); nouns to which it is added denote, in general, objects, properties, phenomena,etc., that surpass customary norms, or instruments designed to produce or deal withsuch things (ultramicroscope; ultrasound; ultrastructure)
Examples of 'ultraclean' in a sentence
ultraclean
The new government must attract investment for, and get actively involved in, developing ultraclean, near-zero emission coal technologies.