Pyroceram means: A brand name for a specific type of glass-ceramic material developed by Corning in the 1950s - the same technology that underlies Corex and CorningWare. Used colloquially in the US as a generic. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.