We found one dictionary that defines the word unknown origin:

General (1 matching dictionary)

1. Unknown Origin: Wikipedia, the Free Encyclopedia

Phrases: Fever of unknown origin, cancer of unknown primary origin, fever of unknown origin (fuo), of unknown origin fever, Of Unknown Origin, more... ▸ Words similar to unknown origin ▸ Usage examples for unknown origin ▸ Idioms related to unknown origin ▸ Wikipedia articles (New!) ▸ Words that often appear near unknown origin ▸ Rhymes of unknown origin ▸ Invented words related to unknown origin