Noun:

1. a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid

EPICS实验物理及工业控制系统epicn.史诗；叙事诗adj.史诗的；叙事诗的；宏大的；壮丽的epicotyle dormancy上胚轴休眠epicardial mapping心外膜标测Epicardial fat pad心脏脂肪垫epicardial surface心外膜面Epicardial poudrage心外膜撒粉法epicenter mechanism震源机制epic representation史诗画epicycloidal motion外摆线运动epicritic sensation精辨觉Epicyclical gearbox行星轮系