| acerbic | (adjective) sour or bitter in taste | Synonyms: acerb, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| barbican | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbacan |
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| herbicide | (noun) a chemical agent that destroys plants or inhibits their growth | Synonyms: weed killer, weedkiller |
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| orbicular | (adjective) circular or nearly circular | Synonyms: orbiculate |
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| (adjective) having the shape of a sphere or ball | Synonyms: ball-shaped, global, globose, globular, spheric, spherical |
| orbiculate | (adjective) circular or nearly circular | Synonyms: orbicular |
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