retention tank

noun

A tank for the retention of toilet waste, e.g. on a train.

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Meanings

nounretention tank (plural retention tanks)

plural retention tanks

  1. A tank for the retention of toilet waste, e.g. on a train.

    Eleven four-coach 'Castles' are on order, with eight delivered. These are former GWR Mk 3s that have been converted by fitting sliding doors, passenger information screens and retention tanks.

    2020 January 2, “Fleet News”, in Rail, page 20
Cite this entry
APA

retention tank. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/retention%20tank

MLA

“retention tank.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/retention%20tank. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “retention tank,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/retention%20tank.

Source: retention tank on Wiktionary, CC BY-SA 4.0.