| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| fulcrum | (noun) the pivot about which a lever turns | - |
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| sacrum | (noun) wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx | - |
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| scrum | (noun) (rugby) the method of beginning play in which the forwards of each team crouch side by side with locked arms; play starts when the ball is thrown in between them and the two sides compete for possession | Synonyms: scrummage |
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| simulacrum | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: effigy, image |
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| (noun) an insubstantial or vague semblance | - |