| abstractor | (noun) one who makes abstracts or summarizes information | Synonyms: abstracter |
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| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
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| actor | (noun) a theatrical performer | Synonyms: histrion, player, role player, thespian |
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| (noun) a person who acts and gets things done | Synonyms: doer, worker |
| agalactosis | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactia |
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| attractor | (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attraction, attractive feature, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attracter |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attraction, draw, drawing card |
| benefactor | (noun) a person who helps people or institutions (especially with financial help) | Synonyms: helper |
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| calefactory | (adjective) serving to heat | Synonyms: calefactive |
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| chiropractor | (noun) a therapist who practices chiropractic | - |
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| chylifactory | (adjective) producing or converting into chyle | Synonyms: chylifactive, chylific |
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| cofactor | (noun) a substance (as a coenzyme) that must join with another to produce a given result | - |
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| contractor | (noun) a bodily organ that contracts | Synonyms: contractile organ |
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| (noun) someone (a person or firm) who contracts to build things | - |
| (noun) (law) a party to a contract | - |
| (noun) the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps | Synonyms: declarer |
| detractor | (noun) one who disparages or belittles the worth of something | Synonyms: depreciator, disparager, knocker |
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| dissatisfactory | (adjective) not up to expectations | Synonyms: disappointing, unsatisfying |
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| extractor | (noun) an instrument for extracting tight-fitting components | - |
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| (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: centrifuge, separator |
| (noun) a mechanism in a firearm that pulls an empty shell case out of the chamber and passes it to the ejector | Synonyms: cartridge extractor, cartridge remover |
| factoid | (noun) a brief (usually one sentence and usually trivial) news item | - |
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| (noun) something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print | - |
| factor | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: cistron, gene |
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| (noun) an abstract part of something | Synonyms: component, constituent, element, ingredient |
| (noun) an independent variable in statistics | - |
| (noun) anything that contributes causally to a result | - |
| (noun) a businessman who buys or sells for another in exchange for a commission | Synonyms: agent, broker |
| (noun) one of two or more integers that can be exactly divided into another integer | Synonyms: divisor |
| (noun) any of the numbers (or symbols) that form a product when multiplied together | - |
| (verb) resolve into factors | Synonyms: factor in, factor out |
| (verb) consider as relevant when making a decision | Synonyms: factor in, factor out |
| (verb) be a contributing factor | - |
| factorial | (adjective) of or relating to factorials | - |
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| (noun) the product of all the integers up to and including a given integer | - |
| factoring | (noun) (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression | Synonyms: factorisation, factorization |
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| factorisation | (noun) (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression | Synonyms: factoring, factorization |
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| factorise | (verb) resolve (a polynomial) into factors | Synonyms: factorize |
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| factorization | (noun) (mathematics) the resolution of an expression into factors such that when multiplied together they give the original expression | Synonyms: factoring, factorisation |
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| factorize | (verb) resolve (a polynomial) into factors | Synonyms: factorise |
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| factory | (noun) a plant consisting of one or more buildings with facilities for manufacturing | Synonyms: manufactory, manufacturing plant, mill |
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| factotum | (noun) a servant employed to do a variety of jobs | - |
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| galactocele | (noun) a cystic tumor containing milk or a milky substance (especially in the mammary glands) | - |
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| galactose | (noun) a simple sugar found in lactose | Synonyms: brain sugar |
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| galactosemia | (noun) a genetic disease (autosomal recessive) in which an enzyme needed to metabolize galactose is deficient or absent; typically develops shortly after birth | - |
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| galactosis | (noun) the secretion of milk | - |
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| lactobacillus | (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk) | - |
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| lactoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| lactogen | (noun) any agent that enhances milk production | - |
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| lactogenic | (adjective) inducing lactation | - |
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| lactoglobulin | (noun) a globular protein found in milk. | - |
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| lactone | (noun) a cyclic intramolecular ester derived from a hydroxy acid. | - |
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| lactose | (noun) a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk | Synonyms: milk sugar |
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| lactosuria | (noun) presence of lactose in the urine; can occur during pregnancy or lactation | - |
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| malefactor | (noun) someone who has committed a crime or has been legally convicted of a crime | Synonyms: criminal, crook, felon, outlaw |
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| manufactory | (noun) a plant consisting of one or more buildings with facilities for manufacturing | Synonyms: factory, manufacturing plant, mill |
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| multifactorial | (adjective) involving or depending on several factors or causes (especially pertaining to a condition or disease resulting from the interaction of many genes) | - |
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| olfactology | (noun) the scientific study of smells or of the sense of smell. | - |
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| olfactory | (adjective) of or relating to olfaction | Synonyms: olfactive |
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| playactor | (noun) an actor who travels around the country presenting plays | Synonyms: barnstormer, play-actor, trouper |
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| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| reactor | (noun) (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements | Synonyms: nuclear reactor |
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| (noun) an electrical device used to introduce reactance into a circuit | - |
| redactor | (noun) someone who puts text into appropriate form for publication | Synonyms: redact, reviser, rewrite man, rewriter |
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| reenactor | (noun) a person who enacts a role in an event that occurred earlier | - |
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| refractometer | (noun) measuring instrument for measuring the refractive index of a substance | - |
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| refractoriness | (noun) the trait of being unmanageable | Synonyms: recalcitrance, recalcitrancy, unmanageableness |
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| refractory | (adjective) stubbornly resistant to authority or control | Synonyms: fractious, recalcitrant |
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| (adjective) temporarily unresponsive or not fully responsive to a process or stimulus | - |
| (adjective) not responding to treatment | Synonyms: stubborn |
| (noun) lining consisting of material with a high melting point; used to line the inside walls of a furnace | Synonyms: furnace lining |
| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| satisfactorily | (adverb) in a satisfactory manner | - |
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| satisfactoriness | (noun) the quality of giving satisfaction sufficient to meet a demand or requirement | - |
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| satisfactory | (adjective) giving satisfaction | - |
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| (adjective) meeting requirements | Synonyms: acceptable, decent |
| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| stactometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stalagmometer, stalogometer |
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| subcontractor | (noun) someone who enters into a subcontract with the primary contractor | - |
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| subtractor | (noun) An electronic logic circuit for calculating the difference between two binary numbers. | - |
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| tractor | (noun) a wheeled vehicle with large wheels; used in farming and other applications | - |
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| (noun) a truck that has a cab but no body; used for pulling large trailers or vans | - |
| transactor | (noun) someone who conducts or carries on business or negotiations | - |
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| unsatisfactorily | (adverb) in an unsatisfactory manner | - |
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| unsatisfactoriness | (noun) the quality of being inadequate or unsuitable | - |
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| unsatisfactory | (adjective) not giving satisfaction | - |
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