Definition of London clay in English:

London clay

noun

  • [mass noun] Clay forming an extensive layer in SE England, dating from the lower Eocene period.

    • ‘For cooling the building during warm weather, naturally chilled groundwater is brought up from the aquifer through holes bored through 410 feet of London clay.’
    • ‘Residents in Southend, Westcliff and Leigh are likely to be hit particularly hard because the soil is predominantly London clay.’
    • ‘Colchester in Essex, where London clay underlies the estuaries, was the home of the renowned Pyfleet oysters.’

Pronunciation:

London clay

/ˈlʌndən/