| lactation | (noun) feeding an infant by giving suck at the breast | Synonyms: suckling |
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| (noun) the production and secretion of milk by the mammary glands | - |
| (noun) the period following birth during which milk is secreted | - |
| lacteal | (noun) any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct | - |
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| lactide | (noun) any of a class of heterocyclic compounds, formally acid anhydrides, formed by heating α-lactones. | - |
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| lactifuge | (noun) any agent that reduces milk secretion (as given to a woman who is not breast feeding) | - |
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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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| 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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| leptodactylid | (noun) toothed frogs: terrestrial or aquatic or arboreal | Synonyms: leptodactylid frog |
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| liquefaction | (noun) the conversion of a solid or a gas into a liquid | - |
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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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| malpractice | (noun) a wrongful act that the actor had no right to do; improper professional conduct | - |
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| (noun) professional wrongdoing that results in injury or damage | - |
| manufactory | (noun) a plant consisting of one or more buildings with facilities for manufacturing | Synonyms: factory, manufacturing plant, mill |
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| manufacture | (noun) the organized action of making of goods and services for sale | Synonyms: industry |
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| (noun) the act of making something (a product) from raw materials | Synonyms: fabrication, manufacturing |
| manufacturer | (noun) a business engaged in manufacturing some product | Synonyms: maker, manufacturing business |
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| (noun) someone who manufactures something | Synonyms: producer |
| manufacturing | (noun) the act of making something (a product) from raw materials | Synonyms: fabrication, manufacture |
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| mycobacteria | (noun) rod-shaped bacteria some saprophytic or causing diseases | Synonyms: mycobacterium |
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| mycobacterium | (noun) rod-shaped bacteria some saprophytic or causing diseases | Synonyms: mycobacteria |
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| myxobacter | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacteria, myxobacterium, slime bacteria |
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| myxobacteria | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacterium, slime bacteria |
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| myxobacterium | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacteria, slime bacteria |
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| nitrobacteria | (noun) soil bacteria that convert nitrites to nitrates | Synonyms: nitric bacteria |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nitrosobacteria | (noun) soil bacteria that oxidize ammonia to nitrites | Synonyms: nitrous bacteria |
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| olfaction | (noun) the faculty that enables us to distinguish scents | Synonyms: olfactory modality, sense of smell, smell |
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| olfactology | (noun) the scientific study of smells or of the sense of smell. | - |
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| oligodactyly | (noun) congenital condition in which some fingers or toes are missing | - |
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| overacting | (noun) poor acting by a ham actor | Synonyms: hamming |
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| overactivity | (noun) excessive activity | - |
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| overreaction | (noun) an excessive reaction; a reaction with inappropriate emotional behavior | - |
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| pact | (noun) a written agreement between two states or sovereigns | Synonyms: accord, treaty |
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| perissodactyl | (noun) placental mammals having hooves with an odd number of toes on each foot | Synonyms: odd-toed ungulate, perissodactyl mammal |
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| petrifaction | (noun) a rock created by petrifaction; an organic object infiltrated with mineral matter and preserved in its original form | - |
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| (noun) the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape | Synonyms: petrification |
| phylactery | (noun) (Judaism) either of two small leather cases containing texts from the Hebrew Scriptures (known collectively as tefillin); traditionally worn (on the forehead and the left arm) by Jewish men during morning prayer | Synonyms: tefillin |
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| playacting | (noun) the performance of a part or role in a drama | Synonyms: acting, performing, playing |
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| playactor | (noun) an actor who travels around the country presenting plays | Synonyms: barnstormer, play-actor, trouper |
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| polydactyly | (noun) birth defect characterized by the presence of more than the normal number of fingers or toes | Synonyms: hyperdactyly |
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| practicability | (noun) the quality of being usable | Synonyms: practicableness |
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| practicableness | (noun) the quality of being usable | Synonyms: practicability |
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| practicality | (noun) concerned with actual use rather than theoretical possibilities | - |
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| practice | (noun) a customary way of operation or behavior | Synonyms: pattern |
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| (noun) systematic training by multiple repetitions | Synonyms: drill, exercise, practice session, recitation |
| (noun) the exercise of a profession | - |
| (noun) translating an idea into action | Synonyms: praxis |
| (noun) knowledge of how something is usually done | - |
| practician | (noun) someone who practices a learned profession | Synonyms: practitioner |
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| practitioner | (noun) someone who practices a learned profession | Synonyms: practician |
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| prolactin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, luteotropin |
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| prophylactic | (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse | Synonyms: condom, rubber, safe, safety |
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| (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventative, preventive |
| protactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protoactinium |
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| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| protraction | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, prolongation |
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| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, prolongation |
| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| pterodactyl | (noun) extinct flying reptile | - |
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| putrefaction | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, degeneracy, depravation, depravity |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, rot, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: rot |
| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| rarefaction | (noun) a decrease in the density of something | - |
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| reactance | (noun) opposition to the flow of electric current resulting from inductance and capacitance (rather than resistance) | - |
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| reactant | (noun) a chemical substance that is present at the start of a chemical reaction | - |
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| reaction | (noun) a bodily process occurring due to the effect of some antecedent stimulus or agent | Synonyms: response |
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| (noun) doing something in opposition to another way of doing it that you don't like | - |
| (noun) an idea evoked by some experience | - |
| (noun) extreme conservatism in political or social matters | - |
| (noun) (mechanics) the equal and opposite force that is produced when any force is applied to a body | - |
| (noun) a response that reveals a person's feelings or attitude | - |
| (noun) (chemistry) a process in which one or more substances are changed into others | Synonyms: chemical reaction |
| reactionary | (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, ultraconservative |
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| reactionism | (noun) the political orientation of reactionaries | - |
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| reactivity | (noun) responsive to stimulation | Synonyms: responsiveness |
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| (noun) ready susceptibility to chemical change | - |
| 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 | - |
| redact | (noun) someone who puts text into appropriate form for publication | Synonyms: redactor, reviser, rewrite man, rewriter |
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| redaction | (noun) the act of putting something in writing | - |
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| (noun) putting something (as a literary work or a legislative bill) into acceptable form | Synonyms: editing |
| redactor | (noun) someone who puts text into appropriate form for publication | Synonyms: redact, reviser, rewrite man, rewriter |
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| reenactment | (noun) performing a role in an event that occurred at an earlier time | - |
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| reenactor | (noun) a person who enacts a role in an event that occurred earlier | - |
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| refraction | (noun) the amount by which a propagating wave is bent | Synonyms: deflection, deflexion |
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| (noun) the change in direction of a propagating wave (light or sound) when passing from one medium to another | - |
| refractiveness | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractivity |
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| refractivity | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractiveness |
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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 | (noun) lining consisting of material with a high melting point; used to line the inside walls of a furnace | Synonyms: furnace lining |
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| retraction | (noun) the act of pulling or holding or drawing a part back | - |
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| (noun) a disavowal or taking back of a previous assertion | Synonyms: abjuration, recantation |
| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| satisfaction | (noun) act of fulfilling a desire or need or appetite | - |
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| (noun) the contentment one feels when one has fulfilled a desire, need, or expectation | - |
| (noun) compensation for a wrong | Synonyms: atonement, expiation |
| (noun) (law) the payment of a debt or fulfillment of an obligation | - |
| (noun) state of being gratified or satisfied | Synonyms: gratification |
| satisfactoriness | (noun) the quality of giving satisfaction sufficient to meet a demand or requirement | - |
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| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| stacte | (noun) (Old Testament) one of several sweet-smelling spices used in incense | - |
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| stactometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stalagmometer, stalogometer |
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| stalactite | (noun) a cylinder of calcium carbonate hanging from the roof of a limestone cave | - |
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| stupefaction | (noun) the action of stupefying; making dull or lethargic | - |
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| (noun) marginal consciousness | Synonyms: grogginess, semiconsciousness, stupor |
| (noun) a feeling of stupefied astonishment | - |
| subcompact | (noun) a car smaller than a compact car | Synonyms: subcompact car |
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| subcontract | (noun) a contract assigning to another party some obligations of a prior contract | - |
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| subcontractor | (noun) someone who enters into a subcontract with the primary contractor | - |
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| subtracter | (noun) a machine that subtracts numbers | - |
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| (noun) a person who subtracts numbers | - |
| subtraction | (noun) the act of subtracting (removing a part from the whole) | Synonyms: deduction |
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| (noun) an arithmetic operation in which the difference between two numbers is calculated | Synonyms: minus |
| subtractor | (noun) An electronic logic circuit for calculating the difference between two binary numbers. | - |
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| surfactant | (noun) a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved | Synonyms: surface-active agent, wetter, wetting agent |
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| syndactylism | (noun) birth defect in which there is partial or total webbing connecting two or more fingers or toes | Synonyms: syndactyly |
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| syndactyly | (noun) birth defect in which there is partial or total webbing connecting two or more fingers or toes | Synonyms: syndactylism |
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| syntactician | (noun) a linguist who specializes in the study of grammar and syntax | Synonyms: grammarian |
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| tact | (noun) consideration in dealing with others and avoiding giving offense | Synonyms: tactfulness |
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| tactfulness | (noun) consideration in dealing with others and avoiding giving offense | Synonyms: tact |
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| (noun) Behavior or actions characterized by careful consideration in dealing with others, to avoid giving offense. | - |
| tactic | (noun) a plan for attaining a particular goal | Synonyms: maneuver, manoeuvre, tactics |
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| tactician | (noun) a person who is skilled at planning tactics | - |
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| tactics | (noun) a plan for attaining a particular goal | Synonyms: maneuver, manoeuvre, tactic |
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| (noun) the branch of military science dealing with detailed maneuvers to achieve objectives set by strategy | - |
| tactility | (noun) the faculty of perceiving (via the skin) pressure or heat or pain | Synonyms: skin perceptiveness, tactual sensation, touch perception |
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| tactlessness | (noun) the quality of lacking tact | - |
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