| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autochthon | (noun) the earliest known inhabitants of a region | - |
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| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autocorrect | (noun) a system for automatically correcting text | - |
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| autocracy | (noun) a political theory favoring unlimited authority by a single individual | - |
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| (noun) a political system governed by a single individual | Synonyms: autarchy |
| autocrat | (noun) a cruel and oppressive dictator | Synonyms: despot, tyrant |
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| autocue | (noun) a device that displays words for people to read | Synonyms: prompter |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| bitstock | (noun) a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring | Synonyms: brace |
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| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoel, cleavage cavity, segmentation cavity |
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| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| blastocyte | (noun) an undifferentiated embryonic cell | - |
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| blastocytoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastoma, embryonal carcinosarcoma |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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| bluestocking | (noun) a woman having literary or intellectual interests | Synonyms: bas bleu |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| buttock | (noun) either of the two large fleshy masses of muscular tissue that form the human rump | Synonyms: cheek |
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| buttocks | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| cleistocarp | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistothecium |
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| colpocystocele | (noun) hernia in which the urinary bladder protrudes through the wall of the vagina; sometimes occurs after childbirth | Synonyms: cystocele |
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| costochondritis | (noun) inflammation at the junction of a rib and its cartilage | - |
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| cryptococcosis | (noun) a fungal infection characterized by nodular lesions--first in the lungs and spreading to the nervous system | - |
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| cryptocoryne | (noun) any plant of the genus Cryptocoryne; evergreen perennials growing in fresh or brackish water; tropical Asia | Synonyms: water trumpet |
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| cryptocurrency | (noun) a currency based on the usage of cryptography to secure transactions | - |
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| cystocele | (noun) hernia in which the urinary bladder protrudes through the wall of the vagina; sometimes occurs after childbirth | Synonyms: colpocystocele |
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| cytochrome | (noun) (biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration) | - |
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| diestock | (noun) a device that holds the dies that cut external threads on metal cylinders | - |
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| feedstock | (noun) the raw material that is required for some industrial process | - |
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| femtochemistry | (noun) the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses | - |
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| galactocele | (noun) a cystic tumor containing milk or a milky substance (especially in the mammary glands) | - |
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| gametocyte | (noun) an immature animal or plant cell that develops into a gamete by meiosis | - |
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| gerontocracy | (noun) a political system governed by old men | - |
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| glottochronology | (noun) the determination of how long ago different languages evolved from a common source language | - |
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| gunstock | (noun) the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun | Synonyms: stock |
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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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| headstock | (noun) the stationary support in a machine or power tool that supports and drives a revolving part (as a chuck or the spindle on a lathe) | - |
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| hematocele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocele, haematocoele, hematocoele |
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| hematochezia | (noun) passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer) | Synonyms: haematochezia |
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| hematochrome | (noun) a reddish coloring material found in some algae | - |
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| hematocoele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocele, haematocoele, hematocele |
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| hematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: haematocolpometra |
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| hematocolpos | (noun) accumulation of menstrual blood in the vagina (usually due to an imperforate hymen) | Synonyms: haematocolpos |
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| hematocrit | (noun) a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood | Synonyms: haematocrit |
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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: haematocrit, packed cell volume |
| hematocyst | (noun) a cyst containing blood | Synonyms: blood cyst, hemorrhagic cyst |
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| hematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: haematocytopenia |
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| hematocyturia | (noun) the presence of red blood cells in the urine | Synonyms: haematocyturia |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| histocompatibility | (noun) condition in which the cells of one tissue can survive in the presence of cells of another tissue | - |
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| immunohistochemistry | (noun) an assay that shows specific antigens in tissues by the use of markers that are either fluorescent dyes or enzymes (such as horseradish peroxidase) | - |
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| keratocele | (noun) hernia of the cornea | - |
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| keratoconjunctivitis | (noun) inflammation of the cornea and conjunctiva | - |
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| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| kinetochore | (noun) a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape | Synonyms: centromere |
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| laughingstock | (noun) a victim of ridicule or pranks | Synonyms: butt, goat, stooge |
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| leptocephalus | (noun) slender transparent larva of eels and certain fishes | - |
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| linstock | (noun) a stick about a meter long with a point on one end (to stick in the ground) and a forked head on the other end (to hold a lighted match); formerly used to fire cannons | - |
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| livestock | (noun) any animals kept for use or profit | Synonyms: farm animal, stock |
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| mastocyte | (noun) a large connective tissue cell that contains histamine and heparin and serotonin which are released in allergic reactions or in response to injury or inflammation | Synonyms: labrocyte, mast cell |
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| mattock | (noun) a kind of pick that is used for digging; has a flat blade set at right angles to the handle | - |
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| meritocracy | (noun) the belief that rulers should be chosen for their superior abilities and not because of their wealth or birth | - |
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| (noun) a form of social system in which power goes to those with superior intellects | - |
| mitochondrion | (noun) an organelle containing enzymes responsible for producing energy | Synonyms: chondriosome |
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| nostoc | (noun) found in moist places as rounded jellylike colonies | - |
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| notochord | (noun) a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates | - |
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| oxytocic | (noun) a drug that induces labor by stimulating contractions of the muscles of the uterus | Synonyms: oxytocic drug |
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| oxytocin | (noun) hormone secreted by the posterior pituitary gland (trade name Pitocin); stimulates contractions of the uterus and ejection of milk | Synonyms: Pitocin |
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| penstock | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: sluice, sluiceway |
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| (noun) regulator consisting of a valve or gate that controls the rate of water flow through a sluice | Synonyms: floodgate, head gate, sluice valve, sluicegate, water gate |
| pericementoclasia | (noun) pus pocket formation around a tooth | - |
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| photocathode | (noun) a cathode that emits electrons when illuminated | - |
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| photocell | (noun) a transducer used to detect and measure light and other radiations | Synonyms: electric eye, magic eye, photoconductive cell, photoelectric cell |
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| photochemistry | (noun) branch of chemistry that deals with the chemical action of light | - |
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| photocoagulation | (noun) surgical procedure that uses an intense laser beam to destroy diseased retinal tissue or to make a scar that will hold the retina in cases of detached retina | - |
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| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
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| photoconduction | (noun) change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation | Synonyms: photoconductivity |
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| photoconductivity | (noun) change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation | Synonyms: photoconduction |
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| photocopier | (noun) a copier that uses photographic methods of making copies | - |
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| photocopy | (noun) a photographic copy of written or printed or graphic work | - |
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| phytochemical | (noun) a chemical substance obtained from plants that is biologically active but not nutritive | - |
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| phytochemist | (noun) a chemist who specializes in the chemistry of plants | - |
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| phytochemistry | (noun) the branch of organic chemistry dealing with the chemistry of plants | - |
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| plutocracy | (noun) a political system governed by the wealthy people | - |
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| plutocrat | (noun) someone who exercises power by virtue of wealth | - |
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| proctocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: rectocele |
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| protoceratops | (noun) small horned dinosaur | - |
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