hebdomad.is N 1 1 LOC P F
hebdomad.is N 1 1 DAT P F
hebdomad.is N 1 1 ABL P F
hebdomada, hebdomadae N (1st) F [XXXFO] veryrare
7; group of seven; end of 7 day period; fever with 7 day period; each 7th day;
week, seven days; Jewish week, one Sabbath to next; weekly gathering/duty rota;
hebdomad.is N 3 1 GEN S F
hebdomas, hebdomadis N (3rd) F [XXXCS]
7; group of seven; end of 7 day period; fever with 7 day period; each 7th day;
week, seven days; Jewish week, one Sabbath to next; weekly gathering/duty rota;
hebdomad.is N 3 7 GEN S F
hebdomas, hebdomados/is N F [XXXDO] lesser
7; group of seven; end of 7 day period; fever with 7 day period; each 7th day;
week, seven days; Jewish week, one Sabbath to next; weekly gathering/duty rota;
*

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.