tachymeterWiktionary 原文英美构词拆解tachytachy-前缀meter-meter后缀tachy-fast-meterUsed to form the names of measuring devices.词源说明From tachy- + -meter.释义名词noun1A surveying instrument for quickly finding distances.2A speed indicator; a tachometer.同族词派生词 3hydrotachymeter·phototachymeter·tachymetry