INLET

inlet. Inlet, n. a passage, entrance, admission

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In″let (?), n. 1. 1. A passage by which an inclosed place may be entered; a place of ingress; entrance.
Doors and windows, inlets of men and of light. Sir H. Wotton. 2. 2. A bay or recess, as in the shore of a sea, lake, or large river; a narrow strip of water running into the land or between islands.
3. 3. That which is let in or inlaid; an inserted material.
☞ Inlet is also used adjectively, as in inlet pipe, inlet valve, etc.