We found 2 dictionaries that define the word hydro-airplane:

General (2 matching dictionaries)

1. hydro-airplane: Merriam-Webster
2. hydro-airplane: Wiktionary

Definitions from Wiktionary (hydro-airplane) ▸ noun:  Synonym of seaplane ▸ Words similar to hydro-airplane ▸ Usage examples for hydro-airplane ▸ Idioms related to hydro-airplane ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hydro-airplane ▸ Words that often appear near hydro-airplane ▸ Rhymes of hydro-airplane ▸ Invented words related to hydro-airplane