| anomalopteryx | (noun) the smallest moa; slender moa about the size of a large turkey | Synonyms: Anomalopteryx oweni |
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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| calyx | (noun) (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green | - |
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| coccyx | (noun) the end of the vertebral column in humans and tailless apes | Synonyms: tail bone |
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| epicalyx | (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calycle, calyculus, false calyx |
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| onyx | (noun) a chalcedony with alternating black and white bands; used in making cameos | - |
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| oryx | (noun) large African antelope with long straight nearly upright horns | Synonyms: pasang |
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| pyx | (noun) any receptacle in which wafers for the Eucharist are kept | Synonyms: pix |
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| (noun) a chest in which coins from the mint are held to await assay | Synonyms: pix, pix chest, pyx chest |
| sardonyx | (noun) an onyx characterized by parallel layers of sard and a different colored mineral | - |
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