Two words
May be 2 words combined (sis+calcus) If not obvious, probably incorrect
calc.us N 2 1 NOM S M
calcus, calci N (2nd) M [DTXFS] Late veryrare
small weight;
s.is V 5 1 PRES ACTIVE SUB 2 S
sum, esse, fui, futurus V [XXXAX]
be; exist; (also used to form verb perfect passive tenses) with NOM PERF PPL
*

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.