التاكومتر مقياس سرعة الدوران
- ONLINE ETYMOLOGY DICTIONARY:
- tachometer (n.)
- 1810, from Gk. Tachos/ταχύς-ταχύτητα "speed" + -meter.
- word-forming element meaning "device or instrument for measuring; commonly -ometer, occasionally -imeter; from Fr. -mètre, from Gk. Metron/μέτρο (see meter (n.3)).
- meter (n.1)
- also metre, "poetic measure," O.E. meter "meter, versification," from L. metrum, from Gk. Metron/μέτρο "meter, a verse; that by which anything is measured; measure, length, size, limit, proportion," from PIE root *me- "measure" (see meter (n.2)). Possibly reborrowed early 14c. (after a 300-year gap in recorded use) from O.Fr. metre, with specific sense of "metrical scheme in verse," from L. metrum.
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