Definition

Noun: 1. A type of heat-resistant glass: Pyrex is a trademark for a specific type of borosilicate glass. Its primary characteristic is a low coefficient of thermal expansion, meaning it does not crack easily when exposed to sudden temperature changes, such as moving from a hot oven to a cold countertop. 2. Glassware made from this material: The word is also commonly used to refer to various pieces of kitchenware, laboratory glassware, or bakeware made from this durable, heat-resistant glass.

Usage Examples

• As a material:
  • The beaker is made of Pyrex, so it can withstand direct heat.
  • Borosilicate glass, like Pyrex, is essential for safe chemical experiments.
• As a product (glassware):
  • She baked the casserole in a Pyrex dish.
  • We store leftovers in Pyrex containers with lids.

Advanced Usage

• The term Pyrex is often used generically to refer to any clear, heat-resistant glass bakeware, even if it is not the original borosilicate formula. In many regions, it has become a common noun for this type of kitchen product.
  • "Hand me that pyrex bowl," she said, referring to the glass mixing bowl on the counter. (Note: When used generically, it is often not capitalized.)

Variants and Related Words

• Borosilicate glass (n): The technical term for the type of glass from which Pyrex was originally made. It is composed of silica and boron trioxide.
• Tempered glass (n): A different type of strengthened glass, often used in modern bakeware. It is very strong but can shatter if its surface is scratched.

Synonyms

• Heat-resistant glass (n): A descriptive term for glass that can tolerate high temperatures.
• Bakeware (n): A general term for dishes used in baking, which can be made of metal, ceramic, or glass.

Related Idioms and Phrases

• "Pyrex vision": This is a playful, informal phrase referencing the brand name and the idea of "x-ray vision." It humorously suggests the ability to see through an opaque container (like a Pyrex dish with a lid) to know what's inside.
  • I don't need to open the fridge; I have Pyrex vision and know the pie is still there.

Noun

1. a borosilicate glass with a low coefficient of expansion; used for heat-resistant glassware in cooking and chemistry