| acroscopic | (adjective) facing or on the side toward the apex | - |
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| acrosome | (noun) a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg | - |
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| across | (adverb) transversely | Synonyms: crossways, crosswise |
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| (adverb) to the opposite side | - |
| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| backcross | (verb) mate a hybrid of the first generation with one of its parents | - |
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| crisscross | (adjective) marked with crossing lines | Synonyms: crisscrossed |
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| (noun) a marking that consists of lines that cross each other | Synonyms: cross, mark |
| (adverb) crossing one another in opposite directions | - |
| (verb) mark with a pattern of crossing lines | - |
| (verb) mark with or consist of a pattern of crossed lines | - |
| (verb) cross in a pattern, often random | - |
| crisscrossed | (adjective) marked with crossing lines | Synonyms: crisscross |
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| crosier | (noun) a staff surmounted by a crook or cross carried by bishops as a symbol of pastoral office | Synonyms: crozier |
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| cross | (adjective) extending or lying across; in a crosswise direction; at right angles to the long axis | Synonyms: thwartwise, transversal, transverse |
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| (adjective) annoyed and irritable | Synonyms: bad-tempered, crabbed, crabby, fussy, grouchy, grumpy, ill-tempered |
| (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: crossbreeding, crossing, hybridisation, hybridization, hybridizing, interbreeding |
| (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: crossbreed, hybrid |
| (noun) a wooden structure consisting of an upright post with a transverse piece | - |
| (noun) a marking that consists of lines that cross each other | Synonyms: crisscross, mark |
| (noun) any affliction that causes great suffering | Synonyms: crown of thorns |
| (verb) breed animals or plants using parents of different races and varieties | Synonyms: crossbreed, hybridise, hybridize, interbreed |
| (verb) trace a line through or across | - |
| (verb) travel across or pass over | Synonyms: cover, cut across, cut through, get across, get over, pass over, track, traverse |
| (verb) meet and pass | - |
| (verb) meet at a point | Synonyms: intersect |
| (verb) fold so as to resemble a cross | - |
| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: baffle, bilk, foil, frustrate, queer, scotch, spoil, thwart |
| (verb) to cover or extend over an area or time period | Synonyms: span, sweep, traverse |
| crossbar | (noun) long thin horizontal crosspiece between two vertical posts | - |
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| (noun) game equipment consisting of a horizontal bar to be jumped or vaulted over | - |
| (noun) a horizontal bar that goes across something | - |
| crossbeam | (noun) a horizontal beam that extends across something | Synonyms: crosspiece, trave, traverse |
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| crossbench | (noun) any of the seats in the House of Commons used by members who do not vote regularly with either the government or the Opposition | - |
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| crossbencher | (noun) a member of the House of Commons who does not vote regularly with either the government or the Opposition | - |
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| crossbill | (noun) finch with a bill whose tips cross when closed | Synonyms: Loxia curvirostra |
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| crossbones | (noun) two crossed bones (or a representation of two crossed bones) used as a symbol danger or death | - |
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| crossbow | (noun) a bow fixed transversely on a wooden stock grooved to direct the arrow (quarrel) | - |
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| crossbred | (adjective) bred from parents of different varieties or species | - |
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| crossbreed | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, hybrid |
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| (verb) breed animals or plants using parents of different races and varieties | Synonyms: cross, hybridise, hybridize, interbreed |
| crossbreeding | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossing, hybridisation, hybridization, hybridizing, interbreeding |
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| (noun) reproduction by parents of different races (especially by white and non-white persons) | Synonyms: interbreeding, miscegenation |
| crosscheck | (noun) an illegal check (chopping at an opponent's arms or stick) | - |
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| (noun) an instance of confirming something by considering information from several sources | - |
| crosscurrent | (noun) actions counter to the main group activity | Synonyms: countercurrent |
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| (noun) a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current | Synonyms: countercurrent, rip, riptide, tide rip |
| crosscut | (noun) a route shorter than the usual one | Synonyms: cutoff, shortcut |
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| (noun) a diagonal path | - |
| (verb) cut using a diagonal line | Synonyms: cut across |
| crosse | (noun) a long racket with a triangular frame; used in playing lacrosse | - |
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| crossed | (adjective) placed crosswise | - |
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| (adjective) (of a check) marked for deposit only as indicated by having two lines drawn across it | - |
| crossfire | (noun) fire from two or more points so that the lines of fire cross | - |
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| (noun) a lively or heated interchange of ideas and opinions | - |
| crosshairs | (noun) a center of interest | - |
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| crosshatch | (noun) shading consisting of multiple crossing lines | Synonyms: hachure, hatch, hatching |
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| (verb) shade with multiple crossing lines | - |
| crosshatched | (adjective) shaded by means of fine parallel or crossed lines | Synonyms: hatched |
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| crosshead | (noun) metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth | - |
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| (noun) a heading of a subsection printed within the body of the text | Synonyms: crossheading |
| crossheading | (noun) a heading of a subsection printed within the body of the text | Synonyms: crosshead |
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| crossing | (noun) a voyage across a body of water (usually across the Atlantic Ocean) | - |
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| (noun) traveling across | - |
| (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, hybridisation, hybridization, hybridizing, interbreeding |
| (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossover, crosswalk |
| (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossroad, crossway, intersection |
| (noun) a point where two lines (paths or arcs etc.) intersect | - |
| (noun) a shallow area in a stream that can be forded | Synonyms: ford |
| crossjack | (noun) the lowermost sail on a mizzenmast | Synonyms: mizzen course |
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| crossly | (adverb) in an ill-natured manner | Synonyms: grouchily, grumpily |
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| crossness | (noun) a disposition to be ill-tempered | Synonyms: crabbedness, crabbiness |
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| (noun) an irritable petulant feeling | Synonyms: choler, fretfulness, fussiness, irritability, peevishness, petulance |
| crossopterygian | (noun) any fish of the order Crossopterygii; most known only in fossil form | Synonyms: lobe-finned fish, lobefin |
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| crossover | (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossing, crosswalk |
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| (noun) the appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience | - |
| (noun) a voter who is registered as a member of one political party but who votes in the primary of another party | Synonyms: crossover voter |
| (noun) the interchange of sections between pairing homologous chromosomes during the prophase of meiosis | Synonyms: crossing over |
| crosspatch | (noun) a bad-tempered person | Synonyms: churl, crank, grouch, grump |
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| crosspiece | (noun) a transverse brace | - |
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| (noun) a horizontal beam that extends across something | Synonyms: crossbeam, trave, traverse |
| crossroad | (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossway, intersection |
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| crossroads | (noun) a point where a choice must be made | - |
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| (noun) a community of people smaller than a village | Synonyms: hamlet |
| (noun) a crisis situation or point in time when a critical decision must be made | Synonyms: critical point, juncture |
| crossruff | (verb) trump alternately in two hands | - |
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| crosstalk | (noun) the presence of an unwanted signal via an accidental coupling | Synonyms: XT |
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| crosstie | (noun) one of the cross braces that support the rails on a railway track | Synonyms: railroad tie, sleeper, tie |
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| crosstown | (adjective) going or extending across a town or city | Synonyms: cross-town |
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| (adverb) across a town or city | - |
| crosswalk | (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossing, crossover |
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| crossway | (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossroad, intersection |
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| crossways | (adverb) transversely | Synonyms: across, crosswise |
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| crosswind | (noun) wind blowing across the path of a ship or aircraft | - |
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| crosswise | (adjective) lying or extending across the length of a thing or in a cross direction | - |
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| (adjective) in the shape of (a horizontal piece on) a cross | - |
| (adverb) transversely | Synonyms: across, crossways |
| (adverb) not in the intended manner | - |
| crossword | (noun) a puzzle in which words corresponding to numbered clues are to be found and written in to squares in the puzzle | Synonyms: crossword puzzle |
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| intercrossed | (adjective) produced by crossbreeding | Synonyms: hybrid |
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| lacrosse | (noun) a game invented by American Indians; now played by two teams who use long-handled rackets to catch and carry and throw the ball toward the opponents' goal | - |
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| macroscopic | (adjective) large enough to be visible with the naked eye | Synonyms: macroscopical |
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| (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopical |
| macroscopical | (adjective) large enough to be visible with the naked eye | Synonyms: macroscopic |
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| (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopic |
| macroscopically | (adverb) without using a microscope | - |
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| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| macrospore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: megaspore |
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| microscope | (noun) magnifier of the image of small objects | - |
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| microscopic | (adjective) of or relating to or used in microscopy | Synonyms: microscopical |
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| (adjective) extremely precise with great attention to details | - |
| (adjective) so small as to be invisible without a microscope | Synonyms: microscopical |
| (adjective) visible under a microscope; using a microscope | Synonyms: microscopical |
| microscopical | (adjective) of or relating to or used in microscopy | Synonyms: microscopic |
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| (adjective) so small as to be invisible without a microscope | Synonyms: microscopic |
| (adjective) visible under a microscope; using a microscope | Synonyms: microscopic |
| microscopically | (adverb) by using a microscope; so as to be visible only with a microscope; as seen with a microscope | - |
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| (adverb) as if by using a microscope; with extreme precision and attention to detail; in minute detail | - |
| microscopist | (noun) a scientist who specializes in research with the use of microscopes | - |
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| microscopy | (noun) research with the use of microscopes | - |
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| microsecond | (noun) one millionth (10^-6) of a second; one thousandth of a millisecond | - |
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| microseism | (noun) a small earthquake | Synonyms: earth tremor, tremor |
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| microsensor | (noun) A submicrometer- to millimeter-size device that converts a nonelectrical physical or chemical quantity, such as pressure, acceleration, temperature, or gas concentration, into an electrical signal; it is generally able to offer better sensitivity, accuracy, dynamic range, and reliability, as well as lower power consumption, compared to larger counterparts. | - |
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| microsomal | (adjective) of or relating to microsomes | - |
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| microsome | (noun) a tiny granule in the cytoplasm that is where protein synthesis takes place under the direction of mRNA | - |
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| microsporangium | (noun) a plant structure that produces microspores | - |
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| microspore | (noun) smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte | - |
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| microsporidian | (noun) parasite of arthropods and fishes that invade and destroy host cells | - |
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| microsporophyll | (noun) in non-flowering plants, a sporophyll that bears only microsporangia | - |
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| microsurgery | (noun) surgery using operating microscopes and miniaturized precision instruments to perform intricate procedures on very small structures | - |
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| myonecrosis | (noun) localized death of muscle cell fibers | - |
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| necrose | (verb) undergo necrosis | Synonyms: gangrene, mortify, sphacelate |
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| necrosis | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, sphacelus |
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| overcrossing | (noun) a bridge designed for pedestrians | Synonyms: footbridge, pedestrian bridge |
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| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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| sacrosanct | (adjective) must be kept sacred | Synonyms: inviolable, inviolate |
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| sucrose | (noun) a complex carbohydrate found in many plants and used as a sweetening agent | Synonyms: saccharose |
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| testcross | (noun) a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring | Synonyms: test-cross |
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| ultramicroscope | (noun) light microscope that uses scattered light to show particles too small to see with ordinary microscopes | Synonyms: dark-field microscope |
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| ultramicroscopic | (adjective) too small to be seen without an ultramicroscope | - |
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| uncross | (verb) change from a crossed to an uncrossed position | - |
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| uncrossed | (adjective) not crossed | - |
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| (adjective) (of a check) not crossed | - |