- a powered railway vehicle used for pulling trains机车：
a diesel locomotive.
柴油机车。
attrib.
1- of, relating to, or effecting locomotion（与）动力（有关）的; 产生动力的：
locomotive power.
原动力。
1.1
- archaic (of a machine, vehicle, or animal) having the power of progressive motion〈古〉（机器, 车辆, 动物）能活动的, 能不停地运动的：
locomotive bivalves have the strongest hinges.
双壳类动物两个贝壳合拢时具有极强的接合力。
词源
early 17th cent. (as an adjective)： from modern Latin locomotivus, from Latin loco （ablative of locus 'place'） + late Latin motivus 'motive', suggested by medieval Latin in loco moveri 'move by change of position'.