| adrenarche | (noun) the increase in activity of the adrenal glands just before puberty | - |
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| archean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archaean |
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| arched | (adjective) constructed with or in the form of an arch or arches | - |
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| (adjective) forming or resembling an arch | Synonyms: arced, arching, arciform, arcuate, bowed |
| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archegoniate | (adjective) of or relating to an archegonium | Synonyms: archegonial |
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| archegonium | (noun) a female sex organ occurring in mosses, ferns, and most gymnosperms | - |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| archeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeological |
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| archeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeologic |
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| archeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archaeologist |
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| archeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archaeology |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| archeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archaeozoic |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archer | (noun) a person who is expert in the use of a bow and arrow | Synonyms: bowman |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| archery | (noun) the sport of shooting arrows with a bow | - |
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| archespore | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archesporium |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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| archetypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypical, prototypal, prototypic, prototypical |
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| archetype | (noun) something that serves as a model or a basis for making copies | Synonyms: original, pilot |
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| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| countercheck | (noun) something that checks the correctness of a previous check | Synonyms: double check |
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| (noun) a check that restrains another check | - |
| (verb) check a second time | - |
| (verb) oppose or check by a counteraction | Synonyms: counteract |
| demarche | (noun) a move or step or maneuver in political or diplomatic affairs | - |
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| kurchee | (noun) tropical Asian tree with hard white wood and bark formerly used as a remedy for dysentery and diarrhea | Synonyms: conessi, Holarrhena antidysenterica, Holarrhena pubescens, ivory tree, kurchi |
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| lorchel | (noun) a large fungus of the family Helvellaceae | - |
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| lurcher | (noun) someone waiting in concealment | Synonyms: lurker, skulker |
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| marcher | (noun) fights on foot with small arms | Synonyms: foot soldier, footslogger, infantryman |
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| (noun) walks with regular or stately step | Synonyms: parader |
| (noun) an inhabitant of a border district | - |
| menarche | (noun) the first occurrence of menstruation in a woman | - |
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| orchestra | (noun) seating on the main floor in a theater | - |
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| (noun) a musical organization consisting of a group of instrumentalists including string players | - |
| orchestral | (adjective) relating to or composed for an orchestra | - |
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| orchestrate | (verb) plan and direct (a complex undertaking) | Synonyms: direct, engineer, mastermind, organise, organize |
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| (verb) write an orchestra score for | - |
| orchestrated | (adjective) arranged for performance by an orchestra | - |
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| orchestration | (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: instrumentation |
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| (noun) an arrangement of events that attempts to achieve a maximum effect | - |
| (noun) an arrangement of a piece of music for performance by an orchestra or band | - |
| orchestrator | (noun) an arranger who writes for orchestras | - |
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| parched | (adjective) toasted or roasted slightly | - |
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| (adjective) dried out by heat or excessive exposure to sunlight | Synonyms: adust, baked, scorched, sunbaked |
| parchesi | (noun) an ancient board game resembling backgammon; played on a cross-shaped board | Synonyms: pachisi, parchisi |
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| percher | (noun) a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists | Synonyms: Insessores, order Insessores, perching bird |
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| (noun) a person situated on a perch | - |
| protoarcheology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarchaeology |
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| recherche | (adjective) lavishly elegant and refined | Synonyms: exquisite |
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| researcher | (noun) a scientist who devotes himself to doing research | Synonyms: investigator, research worker |
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| schnorchel | (noun) air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time | Synonyms: breather, schnorkel, snorkel, snorkel breather |
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| scorched | (adjective) having everything destroyed so nothing is left salvageable by an enemy | - |
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| (adjective) dried out by heat or excessive exposure to sunlight | Synonyms: adust, baked, parched, sunbaked |
| scorcher | (noun) a very hard hit ball | Synonyms: screamer |
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| (noun) an extremely hot day | - |
| searcher | (noun) large metallic blue-green beetle that preys on caterpillars; found in North America | Synonyms: Calosoma scrutator, searcher beetle |
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| (noun) someone making a search or inquiry | Synonyms: quester, seeker |
| (noun) a customs official whose job is to search baggage or goods or vehicles for contraband or dutiable items | - |
| starches | (noun) foodstuff rich in natural starch (especially potatoes, rice, bread) | - |
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| thelarche | (noun) the start of breast development in a woman at the beginning of puberty | - |
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