| plumcot | (noun) hybrid between plum and apricot | - |
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| (noun) hybrid produced by crossing Prunus domestica and Prunus armeniaca | Synonyms: plumcot tree |
| plume | (noun) the light horny waterproof structure forming the external covering of birds | Synonyms: plumage |
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| (noun) a feather or cluster of feathers worn as an ornament | - |
| (noun) anything that resembles a feather in shape or lightness | - |
| plummet | (noun) the metal bob of a plumb line | Synonyms: plumb, plumb bob |
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| plump | (noun) the sound of a sudden heavy fall | - |
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| plumpness | (noun) the bodily property of being well rounded | Synonyms: embonpoint, roundness |
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| plumule | (noun) down feather of young birds; persists in some adult birds | - |
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| reticulum | (noun) the second compartment of the stomach of a ruminant | Synonyms: second stomach |
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| (noun) any fine network (especially one in the body composed of cells or blood vessels) | - |
| siglum | (noun) a sign, abbreviation, letter, or character standing for words in ancient manuscripts or on coins or medals. | - |
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| slum | (noun) a district of a city marked by poverty and inferior living conditions | Synonyms: slum area |
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| slumber | (noun) a dormant or quiescent state | - |
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| (noun) a natural and periodic state of rest during which consciousness of the world is suspended | Synonyms: sleep |
| slumberer | (noun) a rester who is sleeping | Synonyms: sleeper |
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| slumgullion | (noun) a thin stew of meat and vegetables | - |
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| slump | (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slack |
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| (noun) a long-term economic state characterized by unemployment and low prices and low levels of trade and investment | Synonyms: depression, economic crisis |
| slumpflation | (noun) a situation in which economic depression is combined with increasing inflation. | - |
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| spathiphyllum | (noun) any of various plants of the genus Spathiphyllum having a white or green spathe and a spike of fragrant flowers and often cultivated as an ornamental | Synonyms: peace lily, spathe flower |
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| speculum | (noun) a medical instrument for dilating a bodily passage or cavity in order to examine the interior | - |
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| (noun) a mirror (especially one made of polished metal) for use in an optical instrument | - |
| spiculum | (noun) small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals | Synonyms: spicule |
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| spirillum | (noun) any flagellated aerobic bacteria having a spirally twisted rodlike form | Synonyms: spirilla |
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| (noun) spirally twisted elongate rodlike bacteria usually living in stagnant water | - |
| subphylum | (noun) (biology) a taxonomic group ranking between a phylum and a class | - |
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| sugarplum | (noun) any of various small sugary candies | - |
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| superphylum | (noun) (biology) a taxonomic group ranking between a phylum and below a class or subclass | - |
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| tantalum | (noun) a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite | Synonyms: atomic number 73, Ta |
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| vellum | (noun) fine parchment prepared from the skin of a young animal e.g. a calf or lamb | - |
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| (noun) a heavy creamy-colored paper resembling parchment | - |
| velum | (noun) a muscular flap that closes off the nasopharynx during swallowing or speaking | Synonyms: soft palate |
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| (noun) a membranous covering attached to the immature fruiting body of certain mushrooms | Synonyms: veil |
| volume | (noun) physical objects consisting of a number of pages bound together | Synonyms: book |
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| (noun) the magnitude of sound (usually in a specified direction) | Synonyms: intensity, loudness |
| (noun) the property of something that is great in magnitude | Synonyms: bulk, mass |
| (noun) a publication that is one of a set of several similar publications | - |
| (noun) the amount of 3-dimensional space occupied by an object | - |
| (noun) a relative amount | - |
| volumeter | (noun) a meter to measure the volume of gases, liquids, or solids (either directly or by displacement) | - |
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| voluminosity | (noun) greatness of volume | Synonyms: fullness, voluminousness |
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| voluminousness | (noun) greatness of volume | Synonyms: fullness, voluminosity |
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| whatchamacallum | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatsis, widget |
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