roofstone

发音

UK /ˈɹuːfˌstəʊ̯n/
UK /ˈɹʊf-/
CA /ˈɹufˌstoʊ̯n/
US /ˈɹufˌstoʊ̯n/
CA /ˈɹʊf-/
US /ˈɹʊf-/
AU /ˈɹʉːfˌstəʉ̯n/
AU /ˈɹʊf-/
NZ /ˈɹʉːfˌstɐʉ̯n/
NZ /ˈɹʊf-/
SCOT /ˈɹʉfˌston/
SCOT /ˈɹʉf-/
IN /ˈɾuːfˌsʈoːn/
IN /ˈɾʊf-/

词形变化

roofstones 复数 roofstones

释义与例句

n.
  1. 1.

    The stone or rock layer immediately above a coal seam.

    商务 地质 采矿
  2. 2.

    A large, usually flat stone slab placed atop the side-stones (orthostats) of a megalithic burial chamber—such as in portal tombs, wedge tombs, or gallery graves—to form a roof covering the interior space.

词源

From roof + stone.

来源：wiktionary