e/Concrete shell

Information
has gloss	eng: A concrete shell, also commonly called thin shell concrete structure, is a structure composed of a relatively thin shell of concrete, usually with no interior columns or exterior buttresses. The shells are most commonly flat plates and domes, but may also take the form of ellipsoids or cylindrical sections, or some combination thereof. The first concrete shell dates back to the second century.
lexicalization	eng: concrete shell
instance of	(noun) a hemispherical roof dome