| calamus | (noun) the hollow spine of a feather | Synonyms: quill, shaft |
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| (noun) any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes | - |
| (noun) perennial marsh plant having swordlike leaves and aromatic roots | Synonyms: Acorus calamus, flagroot, myrtle flag, sweet calamus, sweet flag |
| (noun) the aromatic root of the sweet flag used medicinally | - |
| hippopotamus | (noun) massive thick-skinned herbivorous animal living in or around rivers of tropical Africa | Synonyms: hippo, Hippopotamus amphibius, river horse |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| ignoramus | (noun) an ignorant person | Synonyms: know nothing, uneducated person |
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| mandamus | (noun) an extraordinary writ commanding an official to perform a ministerial act that the law recognizes as an absolute duty and not a matter for the official's discretion; used only when all other judicial remedies fail | Synonyms: writ of mandamus |
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| ramus | (noun) the posterior part of the mandible that is more or less vertical | - |
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| shamus | (noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: operative, PI, private detective, private eye, private investigator, sherlock |
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| subthalamus | (noun) the ventral part of the thalamus | - |
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| thalamus | (noun) large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon | - |
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