We found one dictionary that defines the word supplementary observation:

Tech (1 matching dictionary)

1. Glossary of Meteorology (No longer online)

▸ Words similar to supplementary observation ▸ Usage examples for supplementary observation ▸ Idioms related to supplementary observation ▸ Wikipedia articles (New!) ▸ Words that often appear near supplementary observation ▸ Rhymes of supplementary observation ▸ Invented words related to supplementary observation