depressor
/dɪˈprɛs.ɚ/ · de·pres·sor
noun
- A device or mechanism that presses down or reduces pressure. The key's depressor ensures a smooth, consistent click when the piano is played.
- A muscle that lowers a part of the body. The depressor labii inferioris pulls the lower lip downward.
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Did you know? In 19th‑century steam engineering, a 'depressor' was a valve used to lower pressure in a boiler, a usage that survives in some modern hydraulic systems.