เกลียวใน(gliiao nai)

Meanings

1NounB2

internal thread; female thread

the spiral groove on the inside of a nut, hole, or fitting that accepts an external thread

Examples

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2AdjectiveB2

internally threaded; female‑threaded

describing a part that has a thread on the inside (in a hole or socket)

Examples

This pipe has an external thread, so you need to find a fitting that has an internal thread.
3 more examples