cromlech

noun

1. 石室冢墓（威尔士史前期坟墓，在两直立石块上覆盖着一方巨大石板）
   a prehistoric tomb in Wales, consisting of a large flat stone laid across the top of two vertical ones

noun

1. a prehistoric megalithic tomb typically having two large upright stones and a capstone

   Synonym:    dolmenportal tomb