| 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 |
| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| impenetrableness | (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrability |
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| interpenetrate | (verb) penetrate mutually or be interlocked | Synonyms: permeate |
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| (verb) spread or diffuse through | Synonyms: diffuse, imbue, penetrate, permeate, pervade, riddle |
| 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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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| 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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| penetrable | (adjective) admitting of penetration or passage into or through | - |
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| (adjective) capable of being penetrated | - |
| penetralium | (noun) the innermost parts | - |
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| penetrate | (verb) come to understand | Synonyms: bottom, fathom |
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| (verb) become clear or enter one's consciousness or emotions | Synonyms: click, come home, dawn, fall into place, get across, get through, sink in |
| (verb) pass into or through, often by overcoming resistance | Synonyms: perforate |
| (verb) insert the penis into the vagina or anus of | - |
| (verb) spread or diffuse through | Synonyms: diffuse, imbue, interpenetrate, permeate, pervade, riddle |
| (verb) make one's way deeper into or through | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: infiltrate |
| penetrating | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrative, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrative |
| penetratingly | (adverb) with ability to see into deeply | Synonyms: penetratively |
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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 |
| penetrative | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrating, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrating |
| penetratively | (adverb) with ability to see into deeply | Synonyms: penetratingly |
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| 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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| ripened | (adjective) of wines, fruit, cheeses; having reached a desired or final condition; (`aged' pronounced as one syllable) | Synonyms: aged |
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| ripeness | (noun) the state of being ripe | - |
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| sharpened | (adjective) having the point made sharp | - |
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| (adjective) made sharp or sharper | - |
| 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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| unopened | (adjective) not yet opened or unsealed | - |
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| unripened | (adjective) not fully developed or mature; not ripe | Synonyms: green, immature, unripe |
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| unsharpened | (adjective) not sharpened | - |
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