Etymology

From head +‎ wallCategory:English compound terms#HEADWALL.

Noun

headwall (plural headwalls)Category:English lemmas#HEADWALLCategory:English nouns#HEADWALLCategory:English countable nouns#HEADWALLCategory:English entries with incorrect language header#HEADWALLCategory:Pages with entries#HEADWALLCategory:Pages with 1 entry#HEADWALL

English Wikipedia has an article on:

headwall

Wikipedia

1. (geographyCategory:en:Geography#HEADWALL) The highest cliff of a glacial cirque.
2. (geologyCategory:en:Geology#HEADWALL) The steep cliff at the back of a cirque.
3. (civil engineering) A retaining wall at the outlet of a drain, culvert or tunnel.

   Synonym: endwall

   • 1950 September, “Central London Railway Jubilee”, in Railway Magazine, page 622:

     The platforms of all stations from Shepherds Bush to Liverpool Street have been lengthened from 325 ft. to 427 ft. between tunnel headwalls, to take longer trains.

     Category:English terms with quotations#HEADWALL

   • 2020 August 12, “Network News: HS2 tunnel portal readied for TBMs”, in Rail, page 10:

     HS2 Ltd has built a 17-metre-high headwall and reinforced the ground at what will become the south portal of the ten-mile Chiltern Tunnel, as part of preparations for the arrival next year of tunnel boring machines (TBMs).

     Category:English terms with quotations#HEADWALL

References

• “headwall”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.