| 单词 | focometer |
| 释义 | focometer in British English (fəʊˈkɒmɪtə) or focimeter (fəʊˈsɪmɪtə) noun an instrument for measuring the focal length of a lens focometer in American English (fouˈkɑmɪtər) noun Optics an instrument for measuring the focal length of a lens or other optical system Word origin [1850–55; foc(us) + -o- + -meter]This word is first recorded in the period 1850–55. Other words that entered Englishat around the same time include: cloakroom, ethos, heavyweight, overprint, proletariat-o- is the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elementsof Greek origin and often used in English as a connective irrespective of etymology(Franco-Italian; geography; seriocomic; speedometer); -meter is a combining form meaning “measure,” used in the names of instruments measuringquantity, extent, degree, etc. Other words that use the affix -meter include: altimeter, interferometer, nephelometer, spectrometer, telemeter |
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