Etymology
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seaplane (n.)

"airplane designed or outfitted to operate from water," 1913, from sea + plane (n.2).

updated on March 15, 2022

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Definitions of seaplane from WordNet
1
seaplane (v.)
glide on the water in a hydroplane;
Synonyms: hydroplane
2
seaplane (n.)
an airplane that can land on or take off from water;
Synonyms: hydroplane
From wordnet.princeton.edu, not affiliated with etymonline.