| gunboat | (noun) a small shallow-draft boat carrying mounted guns; used by costal patrols | - |
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| sunbae | (noun) a female referring to an older male | - |
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| sunbather | (noun) someone who basks in the sunshine in order to get a suntan | - |
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| sunbeam | (noun) a ray of sunlight | Synonyms: sunray |
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| sunberry | (noun) improved garden variety of black nightshade having small edible orange or black berries | Synonyms: garden huckleberry, Solanum burbankii, Solanum melanocerasum, Solanum nigrum guineese, wonderberry |
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| sunblind | (noun) a canopy made of canvas to shelter people or things from rain or sun | Synonyms: awning, sunshade |
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| sunblock | (noun) a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn | Synonyms: sun blocker, sunscreen |
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| sunbonnet | (noun) a large bonnet that shades the face; worn by girls and women | - |
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| sunburn | (noun) redness of the skin caused by exposure to the rays of the sun | Synonyms: erythema solare |
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| sunburst | (noun) a jeweled brooch with a pattern resembling the sun | - |
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| (noun) a design consisting of a central disk resembling the sun and rays emanating from it | - |
| (noun) a sudden emergence of the sun from behind clouds | - |
| unbalance | (noun) a lack of balance or state of disequilibrium | Synonyms: imbalance, instability |
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| (noun) a state of mental disturbance and disorientation | Synonyms: derangement, mental unsoundness |
| unbecomingness | (noun) the quality of being unbecoming | - |
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| (noun) The state of not being flattering, attractive or appropriate. | - |
| unbelief | (noun) a rejection of belief | Synonyms: disbelief |
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| unboundedness | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, infinitude, limitlessness |
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| unbreakableness | (noun) a consistency of something that does not break under pressure | - |
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| ununbium | (noun) a radioactive transuranic element, with atomic number 112 | Synonyms: atomic number 112, element 112, Uub |
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