| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| bullethead | (noun) a head shaped like a bullet | - |
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| daleth | (noun) the 4th letter of the Hebrew alphabet | - |
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| doublethink | (noun) believing two contradictory ideas at the same time | - |
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| isopleth | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isarithm, isogram |
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| lethality | (noun) the quality of being deadly | Synonyms: deadliness |
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| lethargy | (noun) weakness characterized by a lack of vitality or energy | Synonyms: inanition, lassitude, slackness |
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| (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, phlegm, sluggishness |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lassitude, sluggishness |
| phenylethylene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, styrene, vinylbenzene |
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| plethodont | (noun) mostly terrestrial salamanders that breathe through their thin moist skin; lay eggs in moist places on land; rarely enter water | Synonyms: lungless salamander |
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| plethora | (noun) extreme excess | Synonyms: embarrassment, overplus, superfluity |
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| plethysmograph | (noun) a measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains) | - |
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| shibboleth | (noun) a manner of speaking that is distinctive of a particular group of people | - |
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| (noun) a favorite saying of a group, organization or individual | Synonyms: catchword, motto, slogan |
| telethermometer | (noun) a thermometer that registers the temperature at some distant point | - |
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