| sphincter | (noun) a ring of muscle that contracts to close an opening | Synonyms: anatomical sphincter, sphincter muscle |
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| sphingid | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hawkmoth, hummingbird moth, sphinx moth |
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| sphingine | (adjective) resembling a sphinx | - |
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| sphinx | (noun) one of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptians | - |
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| (noun) an inscrutable person who keeps his thoughts and intentions secret | - |