Two words
May be 2 words combined (retro+pendulus) If not obvious, probably incorrect
pendul.us N 2 1 NOM S M
pendulus, penduli N (2nd) M [GXXEK] NeoLatin uncommon
pendulum;
pendul.us ADJ 1 1 NOM S M POS
pendulus, pendula, pendulum ADJ [XXXDX] lesser
hanging, hanging down, uncertain;
retro ADV POS
retro ADV [XXXBX]
backwards, back, to the rear; behind, on the back side; back (time), formerly;
*

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.