clavus

noun2

1. •
   A callous growth, especially on the foot; a corn.

   • In a review of over 1000 interdigital clavuses, 65% were found in the fourth interspace, while the first and third web space clavuses were found in 17% and 16% of the patients respectively[…] — 1988
2. •
   (no longer used) Synonym of ergot.

   • The clavus, or ergot of grain, consists in the enlargement and elongation of the seeds […] — 1817