Assertion: hourglass | /r/Synonym | sand glasses
Facets:
Source sentences:
text: Hourglasses (also called sand glasses and sand clocks) may have been used by the ancient Greeks and Romans, but history can only document the fact that both cultures had the technology to make the glass.
text: Hourglasses (also called sand glasses and sand clocks) may have been used by the ancient Greeks and Romans, but history can only document the fact that both cultures had the technology to make the glass.