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Sphincter

/ˈsfɪŋktər/noun

A ring of muscle that closes a passage in the body by contracting.

The Greek roots

σφιγκτήρ
sphinktḗr
that which binds tight
+
σφίγγω
sphíngō
to squeeze, bind

Literally: the tightener

The story of the word

Galen used σφιγκτήρ for any muscle that shuts a tube by tightening around it, and the body has dozens, from the iris of the eye to the pylorus at the stomach's exit. The Sphinx is generally taken as the same verb, the strangler who throttled travellers who failed her riddle, although her name may have arrived in Greek from Egypt and been reshaped afterwards to fit a Greek etymology. English borrowed sphincter in the sixteenth century straight out of medical Latin.

How it travelled
Ancient Greek → Latin → English
First recorded
16th century

Same family

sphinxsphingosine

In a sentence

Reflux is usually a sphincter that no longer closes properly, not too much acid.

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