Hebdomad

Heb'do·mad noun [ Latin hebdomas , -adis , Greek 'ebdoma`s the number seven days, from ... seventh, ... seven. See Seven .] A week; a period of seven days. [ R.] Sir T. Browne.
Found on http://www.encyclo.co.uk/webster/H/25

hebdomad

hebdomad A group of seven things; a week
Found on http://www.wordinfo.info/words/index/info/view_unit/957/
No exact match found