| ANAPTYXES | • anaptyxes n. Plural of anaptyxis. • ANAPTYXIS n. (Greek) the insertion of a vowel between two consonants for ease of pronunciation.
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| APTERYXES | • apteryxes n. Plural of apteryx. • APTERYX n. (Greek) one of a genus of New Zealand birds that includes the kiwi.
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| ARCHAEOPTERYXES | • archaeopteryxes n. Plural of archaeopteryx. • ARCHAEOPTERYX n. a Jurassic fossil bird of the Archaeopteryx genus, with a long bony tail, sharp-toothed jaws, and wings bearing three clawed digits.
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| BOMBYXES | • bombyxes n. Plural of bombyx. • BOMBYX n. (Greek) a moth of the genus Bombyx, which includes the silkworm moth.
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| BOSTRYXES | • bostryxes n. Plural of bostryx. • BOSTRYX n. (Greek) a type of inflorescence, a way in which flower stems are arranged.
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| CALYXES | • calyxes n. Plural of calyx. • CALYX n. (Greek) the outer protective covering of a flower.
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| CARNYXES | • carnyxes n. Plural of carnyx. • CARNYX n. a long war trumpet used by the Celts.
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| CHALCEDONYXES | • CHALCEDONYX n. an agate of alternating white opaque and greyish transparent chalcedony. | 
| COCCYXES | • coccyxes n. Plural of coccyx. • COCCYX n. (Greek) a bone of the spine.
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| EPICALYXES | • epicalyxes n. Plural of epicalyx. • EPICALYX n. a set of bracts resembling a calyx.
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| ONYXES | • onyxes n. Plural of onyx. • ONYX n. a form of chalcedony consisting of plane layers of different colours.
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| ORYXES | • oryxes n. Plural of oryx. • ORYX n. a kind of African antelope.
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| POMPHOLYXES | • POMPHOLYX n. (Greek) a vesicular eruption or eczema chiefly on the palms and soles. | 
| PTYXES | • ptyxes n. Plural of ptyxis. • PTYXIS n. (Greek) a type of leaf folding in a bud.
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| PYXES | • pyxes n. Plural of pyx. • PYX v. to test newly minted coins.
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| SARDONYXES | • sardonyxes n. Plural of sardonyx. • SARDONYX n. (Greek) an onyx with alternate layers of sard and other mineral.
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