English
seamount
From sea + mount.
Proto-Germanic *saiwiz ‘sea, lake’
Proto-West Germanic *saiwi ‘body of water’
Old English sǣ
Middle English see ‘sea’
English sea
Proto-Indo-European *men- ‘to stand out, tower’
…
Proto-Italic *monts ‘mountain’
Latin mōns ‘hill, mountain’
Old English munt ‘hill, mountain’
Middle English mount ‘mountain’
English mount
Today it means
noun An underwater mountain with a prominence of more than 1,000 meters, which does not breach the surface of the water.
Language periods are conventional ranges, not dates for this word.
Etymograph / seamount