retrogradior
Could not find retrograditur in Logeion dictionaries.
retrograditur Verb: present passive indicative 3rd singular of retrogradior
rē̆trō-grădĭor, di,
- v. dep. n. (collat. form rē̆trōgrădo, āre, v. n., Mart. Cap. 8, § 887), to go back or backwards, to retrograde, Plin. 8, 15, 16, § 39; of the retrograde motion of the stars, id. 2, 15, 12, § 61; 2, 17, 14, § 76; Mart. Cap. 8, § 883.
retrō-gradior, gressus sum, gradī, rückwärts-, zurückgeben, Plin. 8, 40: v. den Sternen, Plin. 2, 61 u.a. Mart. Cap. 8. § 883.
rĕtrōgrădĭor (rĕtrō grădĭor), gressus sum, gradi, intr., rétrograder : Plin. 8, 40 ; 2, 61.