| dampener | (noun) a device that dampens or moistens something | Synonyms: moistener |
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| impenetrability | (noun) the quality of being impenetrable (by people or light or missiles etc.) | Synonyms: imperviousness |
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| (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrableness |
| impenetrableness | (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrability |
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| interpenetration | (noun) mutual penetration; diffusion of each through the other | Synonyms: permeation |
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| (noun) the action of penetrating between or among | - |
| lycopene | (noun) carotenoid that makes tomatoes red; may lower the risk of prostate cancer | - |
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| opener | (noun) a hand tool used for opening sealed containers (bottles or cans) | - |
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| (noun) the first event in a series | - |
| (noun) a person who unfastens or unwraps or opens | Synonyms: undoer, unfastener, untier |
| peneplain | (noun) a more or less level land surface representing an advanced stage of erosion undisturbed by crustal movements | Synonyms: peneplane |
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| peneplane | (noun) a more or less level land surface representing an advanced stage of erosion undisturbed by crustal movements | Synonyms: peneplain |
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| penetrability | (noun) the quality of being penetrable (by people or light or missiles etc.) | Synonyms: perviousness |
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| penetralium | (noun) the innermost parts | - |
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| penetration | (noun) an attack that penetrates into enemy territory | Synonyms: incursion |
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| (noun) the act of entering into or through something | - |
| (noun) the act (by a man) of inserting his penis into the vagina of a woman | - |
| (noun) the depth to which something penetrates (especially the depth reached by a projectile that hits a target) | - |
| (noun) the ability to make way into or through something | - |
| (noun) clear or deep perception of a situation | Synonyms: insight |
| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| polypropene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropylene |
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| propene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propylene |
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| ripeness | (noun) the state of being ripe | - |
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| sharpener | (noun) any implement that is used to make something (an edge or a point) sharper | - |
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| terpene | (noun) an unsaturated hydrocarbon obtained from plants | - |
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