Definition of red clay in US English:

red clay

noun

  • Clay coloured red by its iron content; specifically (a) soil with a high content of red clay; (b) a red or reddish-brown fine-grained deposit covering large areas of the ocean floor, containing windblown particles, meteoric and volcanic dust and debris, and insoluble organic remains.

Origin

Late 15th century; earliest use found in Surgical Treatise. From red + clay.

Pronunciation

red clay

/ˌrɛd ˈkleɪ/