| 单词 | ultramicrometer |
| 释义 | ultramicrometer in British English (ˌʌltrəmaɪˈkrɒmɪtə) noun a micrometer for measuring extremely small distances ultramicrometer in American English (ˌʌltrəmaɪˈkrɑmətər) noun a micrometer for making very small measurements ultramicrometer in American English (ˌultrəmaiˈkrɑmɪtər) noun a micrometer calibrated to a very fine scale and capable of measuring extremely small magnitudes Word origin [1925–30; ultra- + micrometer]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: chain reaction, gimmick, hot spot, payload, turnaroundultra- 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) |
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