| admass | (noun) the segment of the public that is easily influenced by mass media (chiefly British) | - |
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| biomass | (noun) the total mass of living matter in a given unit area | - |
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| (noun) plant materials and animal waste used as fuel | - |
| camass | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camosh, quamash |
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| groundmass | (noun) (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded | - |
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| landmass | (noun) a large continuous extent of land | Synonyms: land mass |
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| mass | (noun) the property of a body that causes it to have weight in a gravitational field | - |
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| (noun) the property of something that is great in magnitude | Synonyms: bulk, volume |
| (noun) the common people generally | Synonyms: hoi polloi, masses, multitude, people, the great unwashed |
| (noun) an ill-structured collection of similar things (objects or people) | - |
| (noun) a body of matter without definite shape | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| massacre | (noun) the savage and excessive killing of many people | Synonyms: butchery, carnage, mass murder, slaughter |
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| massage | (noun) kneading and rubbing parts of the body to increase circulation and promote relaxation | - |
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| massager | (noun) someone who rubs or kneads parts of the body to stimulate circulation and promote relaxation | - |
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| massasauga | (noun) pygmy rattlesnake found in moist areas from the Great Lakes to Mexico; feeds on mice and small amphibians | Synonyms: massasauga rattler, Sistrurus catenatus |
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| (noun) small pygmy rattlesnake | Synonyms: ground rattler, Sistrurus miliaris |
| masse | (noun) a shot in billiards made by hitting the cue ball with the cue held nearly vertically; the cue ball spins around another ball before hitting the object ball | Synonyms: masse shot |
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| masses | (noun) the common people generally | Synonyms: hoi polloi, mass, multitude, people, the great unwashed |
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| masseter | (noun) a large muscle that raises the lower jaw and is used in chewing | - |
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| masseur | (noun) a male massager | - |
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| masseuse | (noun) a female massager | - |
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| massicot | (noun) the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment | Synonyms: massicotite |
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| massicotite | (noun) the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment | Synonyms: massicot |
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| massif | (noun) a block of the earth's crust bounded by faults and shifted to form peaks of a mountain range | - |
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| massiveness | (noun) an unwieldy largeness | Synonyms: bulkiness |
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| (noun) the property of being large in mass | Synonyms: heft, heftiness, ponderosity, ponderousness |