| abohm | (noun) a unit of resistance equal to a billionth of an ohm | - |
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| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| antilogarithm | (noun) the number of which a given number is the logarithm | Synonyms: antilog |
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| drachm | (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachma, dram |
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| (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: fluid drachm, fluid dram, fluidram |
| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: fluid drachm, fluid dram, fluidram |
| fthm | (noun) a linear unit of measurement (equal to 6 feet) for water depth | Synonyms: fathom |
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| (noun) (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore | Synonyms: fathom |
| hemidrachm | (noun) an ancient Greek silver coin equal to 1/2 drachm or 3 obols in value. | - |
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| hm | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hectometre |
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| isarithm | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isogram, isopleth |
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| logarithm | (noun) the exponent required to produce a given number | Synonyms: log |
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| megohm | (noun) a unit of resistance equal to one million ohms | - |
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| ohm | (noun) a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere | - |
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| rhythm | (noun) natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle) | Synonyms: calendar method, calendar method of birth control, rhythm method, rhythm method of birth control |
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| (noun) recurring at regular intervals | Synonyms: regular recurrence |
| (noun) (architecture) the repetitive use of a group of visual elements to establish a recognizable pattern | - |
| (noun) the arrangement of spoken words alternating stressed and unstressed elements | Synonyms: speech rhythm |
| (noun) the basic rhythmic unit in a piece of music | Synonyms: beat, musical rhythm |
| (noun) an interval during which a recurring sequence of events occurs | Synonyms: cycle, round |