Assertion: ether | /r/ObjectUse | used in surgery
Facets:
value: rarely
type: DEGREE
value: until the mid-20th century
type: TEMPORAL
Source sentences:
text: Today, ether is rarely used in surgery.
text: None of these mention that ether was still used occasionally for surgery until the mid-20th century.
text: Neither ether nor chloroform are used in surgery today.