| eptatretus | (noun) a fossil hagfish of the genus Eptatretus | - |
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| fetus | (noun) an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | Synonyms: foetus |
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| foetus | (noun) an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | Synonyms: fetus |
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| impetus | (noun) the act of applying force suddenly | Synonyms: impulse, impulsion |
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| (noun) a force that moves something along | Synonyms: drift, impulsion |
| quietus | (noun) euphemisms for death (based on an analogy between lying in a bed and in a tomb) | Synonyms: eternal rest, eternal sleep, rest, sleep |
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