Ravenscroft
/ˈreɪvnzkrɒft/noun
1Attributive Designating a kind of flint glass or lead glass devised by George Ravenscroft, or an article made of this.
2Ravenscroft glass. Also as a count noun: an article made of this.
Origin
1920s; earliest use found in The Burlington Magazine. From the name of George Ravenscroft, English glass-maker.