Definition of porcelain clay in English:

porcelain clay

Pronunciation /ˈpôrs(ə)lən klā/ /ˈpɔrs(ə)lən kleɪ/

noun

another term for kaolin
‘Most of us can also access the second level of appreciation, since we recognise the purity of the materials employed - from the white porcelain clay to the clean, yellow enamel and the flawless, transparent glaze.’
  • ‘Robineau frequently ornamented her ceramics by carving and piercing the walls and rims - processes called excising and reticulation, respectively - which required precision and patience to execute in dry but unfired porcelain clay.’