airometer means any of various devices used to measure the amount of air used by a system. Lexicurio rates it Sui generis — a strength score of 91 out of 100.
Etymology
From air + -o- + -meter.
noun
- Any of various devices used to measure the amount of air used by a system.“The air passes through large iron pipes, from the engine-house to an airometer, which stands at the centre of the works.”