| aggressor | (noun) someone who attacks | Synonyms: assailant, assaulter, attacker |
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| (noun) a confident assertive person who acts as instigator | - |
| assessor | (noun) an official who evaluates property for the purpose of taxing it | Synonyms: tax assessor |
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| compressor | (noun) a mechanical device that compresses gasses | - |
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| (noun) an electronic device that reduces the dynamic range of an audio signal. | - |
| confessor | (noun) a priest who hears confession and gives absolution | - |
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| (noun) someone who confesses (discloses information damaging to themselves) | - |
| depressor | (noun) a device used by physician to press a part down or aside | - |
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| (noun) any skeletal muscle that draws a body part down | Synonyms: depressor muscle |
| (noun) any nerve whose activity tends to reduce the activity or tone of the body part it serves | Synonyms: depressor nerve |
| immunosuppressor | (noun) a drug that lowers the body's normal immune response | Synonyms: immune suppressant drug, immunosuppressant, immunosuppressive, immunosuppressive drug |
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| intercessor | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intermediary, intermediator, mediator |
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| lessor | (noun) someone who grants a lease | Synonyms: lease giver |
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| microprocessor | (noun) integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system | - |
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| multiprocessor | (noun) a computer that uses two or more processing units under integrated control | - |
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| oppressor | (noun) a person of authority who subjects others to undue pressures | - |
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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| plessor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: percussor, plexor |
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| possessor | (noun) a person who owns something | Synonyms: owner |
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| predecessor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, precursor |
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| (noun) one who precedes you in time (as in holding a position or office) | - |
| pressor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: vasoconstrictive, vasoconstrictor |
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| processor | (noun) (computer science) the part of a computer (a microprocessor chip) that does most of the data processing | Synonyms: C.P.U., central processing unit, central processor, CPU, mainframe |
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| (noun) a business engaged in processing agricultural products and preparing them for market | - |
| (noun) someone who processes things (foods or photographs or applicants etc.) | - |
| professor | (noun) someone who is a member of the faculty at a college or university | Synonyms: prof |
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| repressor | (noun) an agent that represses | Synonyms: represser |
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| stressor | (noun) any agent that causes stress to an organism | - |
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| successor | (noun) a thing or person that immediately replaces something or someone | - |
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| (noun) a person who inherits some title or office | Synonyms: heir |
| (noun) a person who follows next in order | Synonyms: replacement |
| suppressor | (noun) an electrical device for suppressing unwanted currents | Synonyms: suppresser |
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| (noun) a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene) | Synonyms: suppresser, suppresser gene, suppressor gene |
| (noun) someone who suppresses | Synonyms: suppresser |
| thermocompressor | (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, injector, steam ejector, steam injector |
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| transgressor | (noun) someone who transgresses; someone who violates a law or command | - |
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| vasopressor | (noun) any agent that produces vasoconstriction and a rise in blood pressure (usually understood as increased arterial pressure) | - |
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