1. Said of steam as exerting, and of steam engines as employing, a pressure on the piston of under two atmospheres, or 50lbs. to the square inch.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• kow pressure,
• pow pressure,
• oow pressure,
• liw pressure,
• lkw pressure,
• llw pressure,
• lpw pressure,
• l0w pressure,
• l9w pressure,
• loq pressure,
• loa pressure,
• los pressure,
• loe pressure,
• lo3 pressure,
• lo2 pressure,
• low oressure,
• low lressure,
• low -ressure,
• low 0ressure,
• low peessure

The adjective form of "low pressure" is simply "low-pressure".

The plural form of the word "low pressure" is "low pressures".

The singular form of "low pressure" is "low-pressure"