| yellowcake | (noun) an impure mixture of uranium oxides obtained during the processing of uranium ore | Synonyms: U308 |
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| yellowfin | (noun) may reach 400 pounds; worldwide in tropics | Synonyms: Thunnus albacares, yellowfin tuna |
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| yellowhammer | (noun) European bunting the male being bright yellow | Synonyms: Emberiza citrinella, yellow bunting |
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| (noun) large flicker of eastern North America with a red neck and yellow undersurface to wings and tail | Synonyms: Colaptes auratus, yellow-shafted flicker |
| yellowlegs | (noun) either of two North American shorebird with yellow legs | - |
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| yellowness | (noun) yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons | Synonyms: yellow |
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| yellowtail | (noun) superior food fish of the tropical Atlantic and Caribbean with broad yellow stripe along the sides and on the tail | Synonyms: Ocyurus chrysurus, yellowtail snapper |
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| (noun) game fish of southern California and Mexico having a yellow tail fin | Synonyms: Seriola dorsalis |
| yellowthroat | (noun) small olive-colored American warblers with yellow breast and throat | - |
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| yellowwood | (noun) any of various trees having yellowish wood or yielding a yellow extract | Synonyms: yellowwood tree |
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| (noun) the yellow wood of any of various yellowwood trees | - |