| abomasum | (noun) the fourth compartment of the stomach of a ruminant; the one where digestion takes place | Synonyms: fourth stomach |
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| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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| checksum | (noun) a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage | - |
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| dorsum | (noun) the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part) | - |
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| (noun) the posterior part of a human (or animal) body from the neck to the end of the spine | Synonyms: back |
| gypsum | (noun) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) | - |
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| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| omasum | (noun) the third compartment of the stomach of a ruminant | Synonyms: psalterium, third stomach |
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| opossum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: possum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: phalanger, possum |
| possum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: opossum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: opossum, phalanger |
| sargassum | (noun) brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea | Synonyms: gulfweed, sargasso, Sargassum bacciferum |
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| sum | (noun) the whole amount | Synonyms: aggregate, total, totality |
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| (noun) the choicest or most essential or most vital part of some idea or experience | Synonyms: center, centre, core, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance |
| (noun) a quantity obtained by the addition of a group of numbers | Synonyms: amount, total |
| (noun) the final aggregate | Synonyms: sum total, summation |
| (noun) a set containing all and only the members of two or more given sets | Synonyms: join, union |
| (noun) a quantity of money | Synonyms: amount, amount of money, sum of money |
| (verb) determine the sum of | Synonyms: add, add together, add up, sum up, summate, tally, tot, tot up, total, tote up |
| (verb) be a summary of | Synonyms: sum up, summarise, summarize |