| instructress | (noun) a woman instructor | - |
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| intrench | (verb) fix firmly or securely | Synonyms: entrench |
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| intrenchment | (noun) an entrenched fortification; a position protected by trenches | Synonyms: entrenchment |
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| intrepid | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, unfearing |
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| intrepidity | (noun) resolute courageousness | Synonyms: dauntlessness |
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| intrepidly | (adverb) without fear | Synonyms: dauntlessly, fearlessly |
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| jobcentre | (noun) a government office in a town where information about available jobs is displayed and where unemployment benefits are administered | - |
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| kestrel | (noun) small Old World falcon that hovers in the air against a wind | Synonyms: Falco tinnunculus |
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| (noun) small North American falcon | Synonyms: American kestrel, Falco sparverius, sparrow hawk |
| kilolitre | (noun) a metric unit of volume or capacity equal to 1000 liters | Synonyms: cubic meter, cubic metre, kiloliter |
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| kilometre | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometer, klick, km |
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| lacklustre | (adjective) lacking luster or shine | Synonyms: lackluster, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lusterless, lustreless |
| litre | (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, liter |
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| lustre | (noun) a surface coating for ceramics or porcelain | Synonyms: luster |
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| (noun) a quality that outshines the usual | Synonyms: brilliancy, luster, splendor, splendour |
| (noun) the visual property of something that shines with reflected light | Synonyms: luster, sheen, shininess |
| lustreless | (adjective) lacking luster or shine | Synonyms: lackluster, lacklustre, lusterless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lacklustre, lusterless |
| lustrelessness | (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: flatness, lusterlessness, mat, matt, matte |
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| mainstream | (noun) the prevailing current of thought | - |
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| mainstreamed | (adjective) (of the handicapped) placed in regular school classes | - |
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| maltreat | (verb) treat badly | Synonyms: abuse, ill-treat, ill-use, mistreat, step |
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| maltreated | (adjective) subjected to cruel treatment | Synonyms: abused, ill-treated, mistreated |
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| maltreater | (noun) someone who abuses | Synonyms: abuser |
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| maltreatment | (noun) cruel or inhumane treatment | Synonyms: abuse, ill-treatment, ill-usage |
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| mattress | (noun) a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed | - |
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| metacentre | (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: metacenter |
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| methotrexate | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: amethopterin, methotrexate sodium |
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| metre | (noun) rhythm as given by division into parts of equal duration | Synonyms: meter, time |
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| (noun) (prosody) the accent in a metrical foot of verse | Synonyms: beat, cadence, measure, meter |
| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: m, meter |
| metrestick | (noun) a rule one meter long (usually marked off in centimeters and millimeters) | Synonyms: meterstick |
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| micrometre | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micron |
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| micromillimetre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, millimicron, nanometer, nanometre, nm |
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| midstream | (noun) the middle of a stream | - |
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| millilitre | (noun) a metric unit of volume equal to one thousandth of a liter | Synonyms: cc, cubic centimeter, cubic centimetre, mil, milliliter, ml |
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| millimetre | (noun) a metric unit of length equal to one thousandth of a meter | Synonyms: millimeter, mm |
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| minstrel | (noun) a singer of folk songs | Synonyms: folk singer, jongleur, poet-singer, troubadour |
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| (noun) a performer in a minstrel show | - |
| (verb) celebrate by singing, in the style of minstrels | - |
| minstrelsy | (noun) the art of a minstrel | - |
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| (noun) ballads sung by minstrels | - |
| (noun) a troupe of minstrels | - |
| mistreat | (verb) treat badly | Synonyms: abuse, ill-treat, ill-use, maltreat, step |
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| mistreated | (adjective) subjected to cruel treatment | Synonyms: abused, ill-treated, maltreated |
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| mistreatment | (noun) the practice of treating (someone or something) badly | - |
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| mistress | (noun) a woman master who directs the work of others | - |
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| (noun) an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man | Synonyms: fancy woman, kept woman |
| (noun) a woman schoolteacher (especially one regarded as strict) | Synonyms: schoolma'am, schoolmarm, schoolmistress |
| mitre | (noun) a liturgical headdress worn by bishops on formal occasions | Synonyms: miter |
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| (noun) the surface of a beveled end of a piece where a miter joint is made | Synonyms: miter |
| (noun) joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner | Synonyms: miter, miter joint, mitre joint |
| mitrewort | (noun) any of various rhizomatous perennial herbs of the genus Mitella having a capsule resembling a bishop's miter | Synonyms: bishop's cap, miterwort |
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| monotreme | (noun) the most primitive mammals comprising the only extant members of the subclass Prototheria | Synonyms: egg-laying mammal |
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| myriametre | (noun) a metric unit of length equal to 10,000 meters | Synonyms: mym, myriameter |
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| naltrexone | (noun) an oral antagonist against the action of opiates | - |
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| nanometre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometer, nm |
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| negotiatress | (noun) a woman negotiator | Synonyms: negotiatrix |
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| nitre | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, potassium nitrate, saltpeter, saltpetre |
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| norgestrel | (noun) synthetic progestin used in oral contraceptives | - |
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| obstreperous | (adjective) boisterously and noisily aggressive | - |
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| (adjective) noisily and stubbornly defiant | - |
| obstreperously | (adverb) in manner that attracts attention | Synonyms: clamorously, loudly |
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| obstreperousness | (noun) noisy defiance | - |
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| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| outre | (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flakey, flaky, freakish, freaky, gonzo, off-the-wall, outlandish |
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| outreach | (noun) the act of reaching out | - |
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| outstretched | (adjective) fully extended especially in length | - |
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| overstress | (verb) place special or excessive emphasis on | Synonyms: overemphasise, overemphasize |
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| overstretch | (verb) strain abnormally | Synonyms: pull |
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| pesantren | (noun) a Muslim school in Indonesia operated by religious leaders | Synonyms: pesantran |
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| petrel | (noun) relatively small long-winged tube-nosed bird that flies far from land | - |
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| philtre | (noun) a drink credited with magical power; can make the one who takes it love the one who gave it | Synonyms: love-philter, love-philtre, love-potion, philter |
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| piastre | (noun) a fractional monetary unit in Egypt and Lebanon and Sudan and Syria | Synonyms: piaster |
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| (noun) 100 kurus equal 1 lira in Turkey | Synonyms: kurus, piaster |
| picometre | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometer |
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| pipistrel | (noun) small European brown bat | Synonyms: pipistrelle, Pipistrellus pipistrellus |
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| pipistrelle | (noun) small European brown bat | Synonyms: pipistrel, Pipistrellus pipistrellus |
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| pointrel | (noun) a tool used by an engraver | Synonyms: graver, graving tool, pointel |
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| postmistress | (noun) a woman postmaster | - |
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| proprietress | (noun) a woman proprietor | - |
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| putrefacient | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefactive |
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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 |
| putrefactive | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefacient |
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| putrefiable | (adjective) liable to decay or spoil or become putrid | Synonyms: decayable, putrescible, spoilable |
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| putrefy | (verb) become putrid; decay with an offensive smell | - |
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| putrescence | (noun) the quality of rotting and becoming putrid | Synonyms: rottenness |
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| (noun) in a state of progressive putrefaction | Synonyms: corruption, putridness, rottenness |
| putrescent | (adjective) becoming putrid | - |
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| putrescible | (adjective) liable to decay or spoil or become putrid | Synonyms: decayable, putrefiable, spoilable |
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| putrescine | (noun) a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter | - |
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| reconnoitre | (verb) explore, often with the goal of finding something or somebody | Synonyms: reconnoiter, scout |
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| restrengthen | (verb) make strong again | - |
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| retread | (noun) a used automobile tire that has been remolded to give it new treads | Synonyms: recap |
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| (verb) give new treads to (a tire) | Synonyms: remold, remould |
| (verb) use again in altered form | Synonyms: make over, rework |
| retreat | (noun) (military) withdrawal of troops to a more favorable position to escape the enemy's superior forces or after a defeat | - |
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| (noun) withdrawal for prayer and study and meditation | Synonyms: retirement |
| (noun) the act of withdrawing or going backward (especially to escape something hazardous or unpleasant) | - |
| (noun) an area where you can be alone | Synonyms: hideaway |
| (noun) (military) a bugle call signaling the lowering of the flag at sunset | - |
| (noun) (military) a signal to begin a withdrawal from a dangerous position | - |
| (noun) a place of privacy; a place affording peace and quiet | - |
| (verb) make a retreat from an earlier commitment or activity | Synonyms: back away, back out, crawfish, crawfish out, pull back, pull in one's horns, withdraw |
| (verb) pull back or move away or backward | Synonyms: draw back, move back, pull away, pull back, recede, retire, withdraw |
| (verb) move back | Synonyms: retrograde |
| (verb) move away, as for privacy | - |
| retreatant | (noun) a participant in a religious retreat | - |
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| retreated | (noun) people who have retreated | - |
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| retrench | (verb) make a reduction, as in one's workforce | - |
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| (verb) tighten one's belt; use resources carefully | - |
| retrenchment | (noun) the reduction of expenditures in order to become financially stable | Synonyms: curtailment, downsizing |
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| (noun) entrenchment consisting of an additional interior fortification to prolong the defense | - |
| rooftree | (noun) a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters | Synonyms: ridge, ridgepole |
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| saltpetre | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, nitre, potassium nitrate, saltpeter |
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| sceptre | (noun) a ceremonial or emblematic staff | Synonyms: scepter, verge, wand |
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| (noun) the imperial authority symbolized by a scepter | Synonyms: scepter |
| sceptred | (adjective) invested with legal power or official authority especially as symbolized by having a scepter | Synonyms: empowered, sceptered |
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| schoolmistress | (noun) a woman schoolteacher (especially one regarded as strict) | Synonyms: mistress, schoolma'am, schoolmarm |
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| sculptress | (noun) a woman sculptor | - |
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| seamstress | (noun) a woman who makes or mends dresses | Synonyms: modiste, needlewoman, sempstress |
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| seductress | (noun) a woman who seduces | - |
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| sempstress | (noun) a woman who makes or mends dresses | Synonyms: modiste, needlewoman, seamstress |
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| shoetree | (noun) a wooden or metal device that is inserted into a shoe to preserve its shape when it is not being worn | - |
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| (verb) stretch (a shoe) on a shoetree | Synonyms: tree |
| sightread | (verb) perform music from a score without having seen the score before | Synonyms: sight-read |
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| sightreader | (noun) a performer who reads without preparation or prior acquaintance (as in music) | - |
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| slipstream | (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, backwash, race, wash |
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| songstress | (noun) a woman songster (especially of popular songs) | - |
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| spectre | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, specter, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, specter |
| streak | (noun) a narrow marking of a different color or texture from the background | Synonyms: bar, stripe |
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| (noun) a distinctive characteristic | - |
| (noun) a sudden flash (as of lightning) | - |
| (noun) an unbroken series of events | Synonyms: run |
| (verb) mark with spots or blotches of different color or shades of color as if stained | Synonyms: blotch, mottle |
| (verb) move quickly in a straight line | - |
| (verb) run naked in a public place | - |
| streaked | (adjective) marked with or as if with stripes or linear discolorations | Synonyms: streaky |
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| streaker | (noun) someone who takes off all their clothes and runs naked through a public place | - |
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