R / rē^trōgrădus
adjective

rē^trōgrădus

fem. rē^trōgrăda · neut. rē^trōgrădum
(collat. form , , App. M. 4, p. 151), retrogradior
going back; backwards; retrograde;
going back or backwards, retrograde; usually of the stars, Sen. Q. N. 7, 25; Plin. 2, 17, 15, § 77; Sid. Ep. 8, 11: carmen retrogradum (i. e. reciprocum), Aug. Civ. Dei, 17, 15: retrogradis fuga, App. l. l.