| abysm | (noun) a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively) | Synonyms: abyss |
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| aneurysm | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurism |
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| cataclysm | (noun) an event resulting in great loss and misfortune | Synonyms: calamity, catastrophe, disaster, tragedy |
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| (noun) a sudden violent change in the earth's surface | Synonyms: catastrophe |
| dysmenorrhea | (noun) painful menstruation | - |
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| paroxysm | (noun) a sudden uncontrollable attack | Synonyms: convulsion, fit |
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| platysma | (noun) either of two broad muscles located on either side of the neck and innervated by the facial nerve; extends from lower jaw to clavicle and is involved in moving the mouth and jaw | - |
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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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