retroverts's Usage Examples:

The appendages of the second prosthomere are the well-known chelicerae of the Arach nids, rarely, if ever, antenniform, but modified as " retroverts" or clasp-knife fangs in spiders.

Ventral view with the prosomatic appendages cut short excepting the chelicerae (I) whose sharp retroverts are seen.

Appendages of 1st pair have two segments, as in Pedipalpi, but are furnished with poison gland, and are retroverts.

Synonyms:

fall back, recover, recuperate, turn back, turn, go back, revert, relapse, change by reversal, resile, lapse, retrogress, reverse, regress, recidivate, return,

Antonyms:

tide, advance, precede, progress, gain,