| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archaeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeological, archeologic, archeological |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archeology |
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| archaeopteryx | (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 lithographica, archeopteryx |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| azotaemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotemia, uraemia, uremia |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| baedeker | (noun) any of a series of travel guidebooks published by the German firm founded by Karl Baedeker | - |
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| bastnaesite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnasite |
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| blae | (adjective) of bluish-black or grey-blue | - |
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| blaeberry | (noun) erect European blueberry having solitary flowers and blue-black berries | Synonyms: bilberry, Viccinium myrtillus, whinberry, whortleberry |
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| brae | (noun) a slope or hillside | - |
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| brodiaea | (noun) any of several plants of the genus Brodiaea having basal grasslike leaves and globose flower heads on leafless stems resembling those of genus Allium | - |
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| cacodaemon | (noun) an evil spirit | Synonyms: cacodemon |
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| cacodaemonic | (adjective) of or relating to evil spirits | Synonyms: cacodemonic |
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| caecal | (adjective) of or like a cecum | Synonyms: cecal |
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| caecilian | (adjective) of or relating to or belonging to the family Caeciliidae | - |
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| (noun) any of the small slender limbless burrowing wormlike amphibians of the order Gymnophiona; inhabit moist soil in tropical regions | Synonyms: blindworm |
| caecum | (noun) the cavity in which the large intestine begins and into which the ileum opens | Synonyms: blind gut, cecum |
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| caenogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: cainogenesis, cenogenesis, kainogenesis, kenogenesis |
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| caesarean | (adjective) relating to abdominal delivery | Synonyms: caesarian, cesarean, cesarian |
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| (noun) the delivery of a fetus by surgical incision through the abdominal wall and uterus (from the belief that Julius Caesar was born that way) | Synonyms: abdominal delivery, C-section, caesarean delivery, caesarean section, caesarian, caesarian delivery, caesarian section, cesarean, cesarean delivery, cesarean section, cesarian, cesarian section |
| caesarian | (adjective) relating to abdominal delivery | Synonyms: caesarean, cesarean, cesarian |
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| (noun) the delivery of a fetus by surgical incision through the abdominal wall and uterus (from the belief that Julius Caesar was born that way) | Synonyms: abdominal delivery, C-section, caesarean, caesarean delivery, caesarean section, caesarian delivery, caesarian section, cesarean, cesarean delivery, cesarean section, cesarian, cesarian section |
| caesium | (noun) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal | Synonyms: atomic number 55, cesium, Cs |
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| caespitose | (adjective) (of plants) growing in small dense clumps or tufts | Synonyms: cespitose, tufted |
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| caesura | (noun) a break or pause (usually for sense) in the middle of a verse line | - |
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| (noun) a pause or interruption (as in a conversation) | - |
| caesural | (adjective) of or relating to a caesura | - |
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| chaenactis | (noun) any of several United States plants having long stalks of funnel-shaped white or yellow flowers | - |
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| chaeta | (noun) a stiff chitinous seta or bristle especially of an annelid worm | - |
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| chaetal | (adjective) of or relating to chaetae (setae or bristles) | - |
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| chaetodon | (noun) any fish of the genus Chaetodon | - |
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| chaetognath | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: arrowworm |
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| chaetognathan | (adjective) of or relating to arrowworms | Synonyms: chaetognathous |
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| chaetognathous | (adjective) of or relating to arrowworms | Synonyms: chaetognathan |
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| chamaeleon | (noun) lizard of Africa and Madagascar able to change skin color and having a projectile tongue | Synonyms: chameleon |
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| chimaera | (noun) a deep-sea fish with a tapering body, smooth skin, and long threadlike tail | - |
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| (noun) a grotesque product of the imagination | Synonyms: chimera |
| chromaesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromesthesia |
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| cryaesthesia | (noun) hypersensitivity to cold | Synonyms: cryesthesia |
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| cryoanaesthesia | (noun) insensibility resulting from cold | Synonyms: cryoanesthesia |
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| cyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopedia, encyclopaedia, encyclopedia |
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| daedal | (adjective) complex and ingenious in design or function | - |
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| daemon | (noun) an evil supernatural being | Synonyms: daimon, demon, devil, fiend |
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| (noun) a person who is part mortal and part god | Synonyms: demigod |
| deaerate | (verb) remove air or gas from | Synonyms: de-aerate |
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| diaeresis | (noun) a diacritical mark (two dots) placed over a vowel to indicate that it does not form a diphthong with an adjacent vowel | Synonyms: dieresis |
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| dracaena | (noun) an agave that is often cultivated for its decorative foliage | - |
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| dromaeosaur | (noun) a kind of maniraptor | - |
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| encyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopedia |
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| encyclopaedic | (adjective) comprehensive in scope or content (as an encyclopedia) | Synonyms: encyclopedic |
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| encyclopaedism | (noun) profound scholarly knowledge | Synonyms: encyclopedism, eruditeness, erudition, learnedness, learning, scholarship |
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| encyclopaedist | (noun) a person who compiles information for encyclopedias | Synonyms: encyclopedist |
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| endaemonism | (noun) an ethical system that evaluates actions by reference to personal well-being through a life based on reason | Synonyms: eudemonism |
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| eudaemon | (noun) a benevolent spirit | Synonyms: eudemon, good spirit |
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| eudaemonia | (noun) a contented state of being happy and healthy and prosperous | Synonyms: eudaimonia, upbeat, welfare, well-being, wellbeing |
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| eudaemonic | (adjective) producing happiness and well-being | Synonyms: eudemonic |
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| exuviae | (noun) cast-off skins or coverings of various organisms during ecdysis | - |
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| faecal | (adjective) of or relating to feces | Synonyms: fecal |
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| faecalith | (noun) a hard mass of fecal matter | Synonyms: coprolith, fecalith, stercolith |
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| faeces | (noun) solid excretory product evacuated from the bowels | Synonyms: BM, dejection, faecal matter, fecal matter, feces, ordure, stool |
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| faerie | (noun) the enchanted realm of fairies | Synonyms: faery, fairyland |
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| (noun) a small being, human in form, playful and having magical powers | Synonyms: faery, fairy, fay, sprite |
| faery | (noun) the enchanted realm of fairies | Synonyms: faerie, fairyland |
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| (noun) a small being, human in form, playful and having magical powers | Synonyms: faerie, fairy, fay, sprite |
| groenendael | (noun) black-coated sheepdog with a heavily plumed tail | - |
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| gynaecological | (adjective) of or relating to or practicing gynecology | Synonyms: gynecologic, gynecological |
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| gynaecologist | (noun) a specialist in gynecology | Synonyms: gynecologist, woman's doctor |
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| gynaecology | (noun) the branch of medicine that deals with the diseases and hygiene of women | Synonyms: gynecology |
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| gynaeolatry | (noun) the worship of women | Synonyms: gyneolatry, woman-worship |
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| haecceity | (noun) the essence that makes something the kind of thing it is and makes it different from any other | Synonyms: quiddity |
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| haem | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haemitin, hematin, heme, protoheme |
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| haemagglutinate | (verb) cause the clumping together (of red blood cells) | Synonyms: hemagglutinate |
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| haemagglutination | (noun) agglutination of red blood cells | Synonyms: hemagglutination |
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| haemal | (adjective) relating to the blood vessels or blood | Synonyms: haematal, hemal, hematal |
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| haemangioma | (noun) benign angioma consisting of a mass of blood vessels; some appear as birthmarks | Synonyms: hemangioma |
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| haematal | (adjective) relating to the blood vessels or blood | Synonyms: haemal, hemal, hematal |
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| haematemesis | (noun) vomiting blood | Synonyms: hematemesis |
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| haematic | (adjective) relating to or containing or affecting blood | Synonyms: haemic, hematic, hemic |
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| haematinic | (noun) a medicine that increases the hemoglobin content of the blood; used to treat iron-deficiency anemia | Synonyms: hematinic |
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| haematite | (noun) the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form | Synonyms: hematite |
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| haematocele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocoele, hematocele, hematocoele |
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| haematochezia | (noun) passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer) | Synonyms: hematochezia |
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| haematocoele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocele, hematocele, hematocoele |
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| haematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: hematocolpometra |
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| haematocolpos | (noun) accumulation of menstrual blood in the vagina (usually due to an imperforate hymen) | Synonyms: hematocolpos |
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| haematocrit | (noun) a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood | Synonyms: hematocrit |
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| (noun) the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit | Synonyms: hematocrit, packed cell volume |
| haematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: hematocytopenia |
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| haematocyturia | (noun) the presence of red blood cells in the urine | Synonyms: hematocyturia |
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| haematogenesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematopoiesis, haemogenesis, haemopoiesis, hematogenesis, hematopoiesis, hemogenesis, hemopoiesis, sanguification |
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| haematogenic | (adjective) pertaining to the formation of blood or blood cells | Synonyms: haematopoietic, haemopoietic, hematogenic, hematopoietic, hemopoietic |
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| haematohiston | (noun) a colorless protein obtained by removing heme from hemoglobin; the oxygen carrying compound in red blood cells | Synonyms: globin, hematohiston |
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| haematoidin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: bilirubin, hematoidin |
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| haematological | (adjective) of or relating to or involved in hematology | Synonyms: hematologic, hematological |
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| haematologist | (noun) a doctor who specializes in diseases of the blood and blood-forming organs | Synonyms: hematologist |
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| haematology | (noun) the branch of medicine that deals with diseases of the blood and blood-forming organs | Synonyms: hematology |
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| haematolysis | (noun) lysis of erythrocytes with the release of hemoglobin | Synonyms: haemolysis, hematolysis, hemolysis |
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| haematoma | (noun) a localized swelling filled with blood | Synonyms: hematoma |
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| haematopoiesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haemogenesis, haemopoiesis, hematogenesis, hematopoiesis, hemogenesis, hemopoiesis, sanguification |
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