| caltrop | (noun) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed | Synonyms: devil's weed, Tribulus terestris |
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| (noun) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America | Synonyms: Centauria calcitrapa, star-thistle |
| (noun) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits | Synonyms: water chestnut, water chestnut plant |
| strop | (noun) a leather strap used to sharpen razors | - |
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| (verb) sharpen on a strop | - |