It is thought to have entered English as university slang. Thereafter we find it used by the likes of Disraeli and Darwin. As with many Greek words, -os indicates a singular noun.
Many people assume kudos is the plural form, with the singular being a kudo .
They are wrong. There was once a computer operating system called QDOS . I know that cob is the old term for a spider, therefore, a cobweb is a spider web. A cobweb is a single strand of dust, whereas spider webs are multi-stranded in a pattern. You actually have the word you seek already.