[pri.mum mo.bi.le] n, pl primum mobiles [ME, fr. ML, lit., first moving thing] (15c): the outermost concentric sphere conceived in medieval astronomy as carrying the spheres of the fixed stars and the planets in its daily revolution
PRIMUM MOBILE
Meaning of PRIMUM MOBILE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012