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lehr
This term is a highly specialized technical noun used almost exclusively within the glass manufacturing industry. It describes a specific type of annealing oven designed to cool glass at a controlled rate, preventing the structural failure that occurs when glass is cooled too rapidly.
Because it is a piece of industrial equipment, it is used in a literal, physical sense. It does not have metaphorical extensions or common usage in general conversation, appearing primarily in engineering manuals, industrial patents, and glass-blowing textbooks.
Meanings
Examples
The molten glass is moved slowly through the lehr to ensure it cools evenly.
We need to calibrate the temperature zones in the lehr before the next batch.
If the glass stays in the lehr for too short a time, it might crack.
The conveyor belt carries the hot sheets of glass through the long lehr.
Check the lehr settings again or we will have too many rejects today.
I wonder if the lehr is maintaining a consistent thermal gradient.
The factory installed a new energy efficient lehr to reduce costs.
The glass must be annealed in a lehr to remove internal stresses.