sub-aqueous

A form of subaqueous — Existing below the water surface.

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Meanings

adjectivesub-aqueous (not comparable)
  1. alternativenot comparableAlternative form of subaqueous.

    The tunnel is 4 miles 628 yd. long, and is the longest tunnel on a British main-line railway, and the longest sub-aqueous tunnel in the world.

    1948 September and October, “Weekend Works in the Severn Tunnel”, in Railway Magazine, page 298
    1 more example

    [...] he'd been hoping to build a bridge over the River Nova in St Petersburg. The Russians would eventually decide to go under the river, but not before Brunel had shown the way, by building the first sub-aqueous tunnel in the world.

    2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, →ISBN, page 87

Origin

From sub- + aqueous.

Full word history & related roots →
Cite this entry
APA

sub-aqueous. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/sub-aqueous

MLA

“sub-aqueous.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sub-aqueous. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “sub-aqueous,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/sub-aqueous.

Source: sub-aqueous on Wiktionary, CC BY-SA 4.0.