| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| anisotropy | (noun) the property of being anisotropic; having a different value when measured in different directions | - |
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| entropy | (noun) (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work | Synonyms: randomness, S |
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| (noun) (communication theory) a numerical measure of the uncertainty of an outcome | Synonyms: information, selective information |
| extropy | (noun) the prediction that human intelligence and technology will enable life to expand in an orderly way throughout the entire universe | - |
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| hypermetropy | (noun) abnormal condition in which vision for distant objects is better than for near objects | Synonyms: farsightedness, hypermetropia, hyperopia, longsightedness |
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| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| lycanthropy | (noun) (folklore) the magical ability of a person to assume the characteristics of a wolf | - |
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| micropylar | (adjective) of or relating to a micropyle | - |
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| micropyle | (noun) minute opening in the wall of an ovule through which the pollen tube enters | - |
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| misanthropy | (noun) a disposition to dislike and mistrust other people | - |
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| (noun) hatred of mankind | - |
| philanthropy | (noun) voluntary promotion of human welfare | Synonyms: philanthropic gift |
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| polypropylene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropene |
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| propyl | (noun) the monovalent organic group C3H7- obtained from propane | Synonyms: propyl group, propyl radical |
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| propylene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propene |
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| propylthiouracil | (noun) a crystalline compound used as an antithyroid drug in the treatment of goiter | - |
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| ropy | (adjective) of or resembling rope (or ropes) in being long and strong | Synonyms: ropey |
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| (adjective) (British informal) very poor in quality | Synonyms: ropey |
| (adjective) forming viscous or glutinous threads | Synonyms: ropey, stringy, thready |
| uropygium | (noun) posterior part of a bird's body from which the tail feathers grow | - |
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| zoanthropy | (noun) the delusion that you have assumed the form of an animal | - |
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