| heliometer | (noun) an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope | - |
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| hereafter | (noun) the time yet to come | Synonyms: future, futurity, time to come |
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| (noun) life after death | Synonyms: afterlife |
| (adverb) in a subsequent part of this document or statement or matter etc. | Synonyms: hereinafter, hereunder |
| (adverb) following this in time or order or place; after this | - |
| (adverb) in a future life or state | - |
| hereinafter | (adverb) in a subsequent part of this document or statement or matter etc. | Synonyms: hereafter, hereunder |
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| hesitater | (noun) one who hesitates (usually out of fear) | Synonyms: hesitator, vacillator, waverer |
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| hexameter | (noun) a verse line having six metrical feet | - |
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| highlighter | (noun) a fluorescent marker used to mark important passages in a text | - |
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| (noun) a cosmetic used to highlight the eyes or cheekbones | - |
| highwater | (noun) the tide when the water is highest | Synonyms: high tide, high water |
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| hindquarter | (noun) the back half of a side of meat | - |
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| hipster | (noun) someone who rejects the established culture; advocates extreme liberalism in politics and lifestyle | Synonyms: flower child, hippie, hippy |
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| hitter | (noun) (baseball) a ballplayer who is batting | Synonyms: batsman, batter, slugger |
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| (noun) someone who hits | Synonyms: striker |
| hodometer | (noun) a meter that shows mileage traversed | Synonyms: mileometer, milometer, odometer |
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| hoister | (noun) an operator of a hoist | - |
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| holster | (noun) a sheath (usually leather) for carrying a handgun | - |
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| (noun) a belt with loops or slots for carrying small hand tools | - |
| hooter | (noun) nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes | Synonyms: bird of Minerva, bird of night, owl |
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| (noun) a device on an automobile for making a warning noise | Synonyms: automobile horn, car horn, horn, motor horn |
| (noun) informal terms for the nose | Synonyms: beak, honker, nozzle, schnoz, schnozzle, snoot, snout |
| housemaster | (noun) teacher in charge of a school boardinghouse | - |
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| huckster | (noun) a seller of shoddy goods | Synonyms: cheap-jack |
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| (noun) a person who writes radio or tv advertisements | - |
| (verb) sell or offer for sale from place to place | Synonyms: hawk, monger, peddle, pitch, vend |
| (verb) wrangle (over a price, terms of an agreement, etc.) | Synonyms: chaffer, haggle, higgle |
| hunter | (noun) a watch with a hinged metal lid to protect the crystal | Synonyms: hunting watch |
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| (noun) someone who hunts game | Synonyms: huntsman |
| (noun) a person who searches for something | - |
| hydrometer | (noun) a measuring instrument for determining the specific gravity of a liquid or solid | Synonyms: gravimeter |
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| hygrometer | (noun) measuring instrument for measuring the relative humidity of the atmosphere | - |
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| hymenopter | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopteran, hymenopteron, hymenopterous insect |
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| hypercoaster | (noun) a roller coaster that goes up 200 feet or higher and can catapult riders from 0 to 70 mph in 4 seconds by motors originally designed to launch rockets | - |
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| hypsometer | (noun) an altimeter that uses the boiling point of water to determine land elevation | - |
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| idolater | (noun) a person who worships idols | Synonyms: idol worshiper, idoliser, idolizer |
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| igniter | (noun) a device for lighting or igniting fuel or charges or fires | Synonyms: ignitor, light, lighter |
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| (noun) a substance used to ignite or kindle a fire | Synonyms: ignitor, lighter |
| importer | (noun) someone whose business involves importing goods from outside (especially from a foreign country) | - |
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| imposter | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, impostor, pretender, pseud, pseudo, role player, sham, shammer |
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| inciter | (noun) someone who deliberately foments trouble | Synonyms: firebrand, instigant, instigator, provoker |
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| inclinometer | (noun) a measuring instrument for measuring the angle of magnetic dip (as from an airplane) | Synonyms: dip circle |
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| (noun) an instrument showing the angle that an aircraft makes with the horizon | - |
| (noun) an instrument used by surveyors in order to measure an angle of inclination or elevation | Synonyms: clinometer |
| inflater | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflator |
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| inter | (verb) place in a grave or tomb | Synonyms: bury, entomb, inhume, lay to rest |
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| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| interpreter | (noun) (computer science) a program that translates and executes source language statements one line at a time | Synonyms: interpretive program |
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| (noun) an advocate who represents someone else's policy or purpose | Synonyms: representative, spokesperson, voice |
| (noun) someone who mediates between speakers of different languages | Synonyms: translator |
| (noun) someone who uses art to represent something | - |
| interrupter | (noun) a device for automatically interrupting an electric current | - |
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| inverter | (noun) an electrical converter that converts direct current into alternating current | - |
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| jerkwater | (adjective) small and remote and insignificant | Synonyms: one-horse, pokey, poky |
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| jester | (noun) a professional clown employed to entertain a king or nobleman in the Middle Ages | Synonyms: fool, motley fool |
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| jitter | (noun) small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources | - |
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| (noun) a small irregular movement | - |
| jointer | (noun) a long carpenter's plane used to shape the edges of boards so they will fit together | Synonyms: jointer plane, jointing plane, long plane |
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| jokester | (noun) a person who enjoys telling or playing jokes | Synonyms: joker |
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| jotter | (noun) a small notebook for rough notes | - |
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| katharometer | (noun) measures thermal conductivity | - |
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| keister | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| kelter | (noun) in working order | Synonyms: kilter |
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| kicksorter | (noun) scientific instrument consisting of an electronic circuit that permits only voltage pulses of predetermined height to pass | Synonyms: pulse height analyzer |
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| kiloliter | (noun) a metric unit of volume or capacity equal to 1000 liters | Synonyms: cubic meter, cubic metre, kilolitre |
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| kilometer | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometre, klick, km |
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| kilter | (noun) in working order | Synonyms: kelter |
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| knitter | (noun) someone who makes garments (or fabrics) by intertwining yarn or thread | - |
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| konimeter | (noun) A konimeter is a device for measuring airborne dust concentration in which samples are obtained by sucking the air through a hole and allowing it to pass over a glass plate coated with grease on which the particles collect. | - |
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| lackluster | (adjective) lacking luster or shine | Synonyms: lacklustre, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lacklustre, lusterless, lustreless |
| lamenter | (noun) a person who is feeling grief (as grieving over someone who has died) | Synonyms: griever, mourner, sorrower |
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| lamplighter | (noun) (when gas was used for streetlights) a person who lights and extinguishes streetlights | - |
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| later | (adjective) at or toward an end or late period or stage of development | Synonyms: late |
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| (adjective) coming at a subsequent time or stage | Synonyms: posterior, ulterior |
| (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterward, afterwards, later on, subsequently |
| (adverb) at some eventual time in the future | Synonyms: by and by |
| (adverb) comparative of the adverb `late' | - |
| latter | (adjective) referring to the second of two things or persons mentioned (or the last one or ones of several) | - |
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| (noun) the second of two or the second mentioned of two | - |
| laughter | (noun) the activity of laughing; the manifestation of joy or mirth or scorn | - |
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| (noun) the sound of laughing | Synonyms: laugh |
| leister | (noun) a spear with three or more prongs; used for spearing fish (especially salmon) | - |
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| letter | (noun) a written message addressed to a person or organization | Synonyms: missive |
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| (noun) the conventional characters of the alphabet used to represent speech | Synonyms: alphabetic character, letter of the alphabet |
| (noun) an award earned by participation in a school sport | Synonyms: varsity letter |
| (noun) a strictly literal interpretation (as distinct from the intention) | - |
| (noun) owner who lets another person use something (housing usually) for hire | - |
| (verb) mark letters on or mark with letters | - |
| (verb) set down or print with letters | - |
| (verb) win an athletic letter | - |
| levanter | (noun) an easterly wind in the western Mediterranean area | - |
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| lifter | (noun) an athlete who lifts barbells | Synonyms: weightlifter |
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| (noun) a thief who steals goods that are in a store | Synonyms: booster, shoplifter |
| lighter | (noun) a device for lighting or igniting fuel or charges or fires | Synonyms: igniter, ignitor, light |
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| (noun) a flatbottom boat for carrying heavy loads (especially on canals) | Synonyms: barge, flatboat, hoy |
| (noun) a substance used to ignite or kindle a fire | Synonyms: igniter, ignitor |
| (verb) transport in a flatbottom boat | - |
| limewater | (noun) solution of calcium hydroxide in water used as an antacid | - |
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| limiter | (noun) (electronics) a nonlinear electronic circuit whose output is limited in amplitude; used to limit the instantaneous amplitude of a waveform (to clip off the peaks of a waveform) | Synonyms: clipper |
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| limnimeter | (noun) a tide gage used for measuring lake level variations. | - |
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| lister | (noun) moldboard plow with a double moldboard designed to move dirt to either side of a central furrow | Synonyms: lister plough, lister plow, middle buster, middlebreaker |
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| (noun) assessor who makes out the tax lists | - |
| liter | (noun) a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints) | Synonyms: cubic decimeter, cubic decimetre, l, litre |
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| litter | (noun) material used to provide a bed for animals | Synonyms: bedding, bedding material |
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| (noun) conveyance consisting of a chair or bed carried on two poles by bearers | - |
| (noun) the offspring at one birth of a multiparous mammal | - |
| (noun) rubbish carelessly dropped or left about (especially in public places) | - |
| (verb) give birth to a litter of animals | - |
| (verb) make a place messy by strewing garbage around | - |
| (verb) strew | - |
| lobster | (noun) any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae | - |
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| (noun) flesh of a lobster | - |
| locater | (noun) a person who fixes the boundaries of land claims | Synonyms: locator |
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| lockmaster | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockkeeper, lockman |
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| loiter | (verb) be about a place without any apparent purpose | Synonyms: footle, hang around, lallygag, linger, loaf, lollygag, lounge, lurk, mess about, mill about, mill around, tarry |
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| looter | (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, pillager, plunderer, raider, spoiler |
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| luster | (noun) a surface coating for ceramics or porcelain | Synonyms: lustre |
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| (noun) a quality that outshines the usual | Synonyms: brilliancy, lustre, splendor, splendour |
| (noun) the visual property of something that shines with reflected light | Synonyms: lustre, sheen, shininess |
| machmeter | (noun) speedometer for measuring the speed of an aircraft relative to the speed of sound | - |
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| magnetometer | (noun) a meter to compare strengths of magnetic fields | Synonyms: gaussmeter |
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| mailsorter | (noun) a sorter for sorting mail according to the address | - |
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| maltreater | (noun) someone who abuses | Synonyms: abuser |
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| maltster | (noun) a maker of malt | Synonyms: maltman |
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| manometer | (noun) a pressure gauge for comparing pressures of a gas | - |
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| manslaughter | (noun) homicide without malice aforethought | - |
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| manumitter | (noun) someone who frees others from bondage | Synonyms: emancipator |
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| marketer | (noun) someone who promotes or exchanges goods or services for money | Synonyms: seller, trafficker, vender, vendor |
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| masseter | (noun) a large muscle that raises the lower jaw and is used in chewing | - |
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| master | (adjective) most important element | Synonyms: chief, main, primary, principal |
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| (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master copy, original |
| (noun) key that secures entrance everywhere | Synonyms: master key, passe-partout, passkey |
| (noun) an artist of consummate skill | Synonyms: maestro |
| (noun) a combatant who is able to defeat rivals | Synonyms: superior, victor |
| (noun) an authority qualified to teach apprentices | Synonyms: professional |
| (noun) directs the work of others | - |
| (noun) a person who has general authority over others | Synonyms: lord, overlord |
| (noun) someone who holds a master's degree from academic institution | - |
| (noun) presiding officer of a school | Synonyms: headmaster, schoolmaster |
| (noun) an officer who is licensed to command a merchant ship | Synonyms: captain, sea captain, skipper |
| (verb) have a firm understanding or knowledge of; be on top of | Synonyms: control |
| (verb) be or become completely proficient or skilled in | Synonyms: get the hang |
| (verb) get on top of; deal with successfully | Synonyms: get over, overcome, subdue, surmount |
| (verb) have dominance or the power to defeat over | Synonyms: dominate |
| mater | (noun) an informal use of the Latin word for mother; sometimes used by British schoolboys or used facetiously | - |
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| matter | (noun) that which has mass and occupies space | - |
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| (noun) (used with negation) having consequence | - |
| (noun) some situation or event that is thought about | Synonyms: issue, subject, topic |
| (noun) a vaguely specified concern | Synonyms: affair, thing |
| (noun) a problem | - |
| (noun) written works (especially in books or magazines) | - |
| (verb) have weight; have import, carry weight | Synonyms: count, weigh |
| meeter | (noun) a person who is present and participates in a meeting | Synonyms: attendant, attendee, attender |
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| melter | (noun) a worker who melts substances (metal or wax etc.) | - |
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| meltwater | (noun) melted snow or ice | - |
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| metacenter | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacentre |
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| meter | (noun) any of various measuring instruments for measuring a quantity | - |
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| (noun) rhythm as given by division into parts of equal duration | Synonyms: metre, time |
| (noun) (prosody) the accent in a metrical foot of verse | Synonyms: beat, cadence, measure, metre |
| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: m, metre |
| (verb) measure with a meter | - |
| (verb) stamp with a meter indicating the postage | - |
| microcomputer | (noun) a small digital computer based on a microprocessor and designed to be used by one person at a time | Synonyms: PC, personal computer |
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| micrometer | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometre, micron |
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| (noun) caliper for measuring small distances | Synonyms: micrometer caliper, micrometer gauge |
| micromillimeter | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimetre, millimicron, nanometer, nanometre, nm |
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| microphotometer | (noun) special kind of densitometer that measures density variations over a very small area | - |
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| midwinter | (noun) the middle of winter | - |
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| mileometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, milometer, odometer |
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| milliammeter | (noun) a sensitive ammeter graduated in milliamperes | - |
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| milliliter | (noun) a metric unit of volume equal to one thousandth of a liter | Synonyms: cc, cubic centimeter, cubic centimetre, mil, millilitre, ml |
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| millimeter | (noun) a metric unit of length equal to one thousandth of a meter | Synonyms: millimetre, mm |
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| millivoltmeter | (noun) sensitive voltmeter that can measure voltage in millivolts | - |
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