acrobat (n.)

1845, from French acrobate "tightrope-walker" (14c.) and directly from a Latinized form of Greek akrobates "rope dancer, gymnastic performer," which is related to akrobatos "going on tip-toe, climbing up high," from akros "topmost, at the point end" (from PIE root *ak- "be sharp, rise (out) to a point, pierce") + Greek agential element -bates "one that goes, one that treads (in some manner), one that is based," from -batos, verbal adjective from stem of bainein "to go, walk, step," from PIE root *gwa- "to go, come."