| antithyroid | (adjective) having the effect of counteracting excessive thyroid activity | - |
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| argyrodite | (noun) a rare steel-grey mineral consisting of silver and germanium and sulfur | - |
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| autogyro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, gyroplane |
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| byroad | (noun) a side road little traveled (as in the countryside) | Synonyms: bypath, byway |
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| gyro | (noun) rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction | Synonyms: gyroscope |
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| (noun) a Greek sandwich: sliced roast lamb with onion and tomato stuffed into pita bread | - |
| gyrocompass | (noun) a compass that does not depend on magnetism but uses a gyroscope instead | - |
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| gyromitra | (noun) any fungus of the genus Gyromitra | - |
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| gyroplane | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, autogyro |
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| gyroscope | (noun) rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction | Synonyms: gyro |
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| gyroscopic | (adjective) having the characteristics of a gyroscope | - |
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| gyrostabiliser | (noun) a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane | Synonyms: gyrostabilizer |
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| gyrostabilizer | (noun) a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane | Synonyms: gyrostabiliser |
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| hyperparathyroidism | (noun) excessive secretion of parathyroid hormone resulting in abnormally high levels of calcium in the blood; can affect many systems of the body (especially causing bone resorption and osteoporosis) | - |
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| hyperthyroidism | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: thyrotoxicosis |
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| hypoparathyroidism | (noun) inadequate secretion of parathyroid hormone resulting in abnormally low levels of calcium in the blood | - |
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| hypothyroidism | (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones | - |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iodotyrosine | (noun) tyrosine with iodine added | - |
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| jellyroll | (noun) thin sheet of sponge cake spread with jelly and then rolled up to make a cylindrical cake | Synonyms: Swiss roll |
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| liothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: T, triiodothyronine |
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| mesophyron | (noun) a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges | Synonyms: glabella |
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| myrobalan | (noun) small Asiatic tree bearing edible red or yellow fruit | Synonyms: cherry plum, myrobalan plum, Prunus cerasifera |
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| parathyroid | (noun) any one of four endocrine glands situated above or within the thyroid gland | Synonyms: parathyroid gland |
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| payroll | (noun) the department that determines the amounts of wage or salary due to each employee | Synonyms: payroll department |
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| (noun) a list of employees and their salaries | Synonyms: paysheet |
| (noun) the total amount of money paid in wages | Synonyms: paysheet |
| pennyroyal | (noun) Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil | Synonyms: Mentha pulegium |
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| (noun) erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine | Synonyms: American pennyroyal, Hedeoma pulegioides |
| playroom | (noun) a recreation room for noisy activities (parties or children's play etc) | Synonyms: game room, rumpus room |
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| puttyroot | (noun) North American orchid bearing a single leaf and yellowish-brown flowers | Synonyms: adam-and-eve, Aplectrum hyemale |
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| pyrocellulose | (noun) nitrocellulose containing less nitrogen than guncotton; used in making smokeless powder | - |
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| pyrochemical | (adjective) of or relating to or produced by chemical reactions at high temperatures | - |
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| pyrochemistry | (noun) processes for chemical reactions at high temperatures | Synonyms: pyrochemical process |
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| pyroelectric | (adjective) relating to or exhibiting pyroelectricity | Synonyms: pyroelectrical |
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| pyroelectrical | (adjective) relating to or exhibiting pyroelectricity | Synonyms: pyroelectric |
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| pyroelectricity | (noun) generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature | - |
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| pyrogallic | (adjective) of or relating to pyrogallol | - |
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| pyrogallol | (noun) a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer | Synonyms: pyrogallic acid |
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| pyrogen | (noun) any substance that can cause a rise in body temperature | Synonyms: pyrectic |
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| (noun) any substance characterized by its great flammability | - |
| pyrogenetic | (adjective) produced by or producing fever | Synonyms: pyrogenic, pyrogenous |
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| pyrogenic | (adjective) produced under conditions involving intense heat | Synonyms: igneous, pyrogenous |
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| (adjective) produced by or producing fever | Synonyms: pyrogenetic, pyrogenous |
| pyrogenous | (adjective) produced under conditions involving intense heat | Synonyms: igneous, pyrogenic |
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| (adjective) produced by or producing fever | Synonyms: pyrogenetic, pyrogenic |
| pyrograph | (noun) a design produced by pyrography | - |
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| pyrographer | (noun) an artist who practices pyrography | - |
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| pyrographic | (adjective) of or relating to or produced by pyrography | - |
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| pyrography | (noun) the act of producing drawings on wood or leather by using heated tools or a fine flame | - |
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| pyrola | (noun) any of several evergreen perennials of the genus Pyrola | Synonyms: wintergreen |
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| pyrolatry | (noun) the worship of fire | Synonyms: fire-worship |
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| pyroligneous | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyrolignic |
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| pyrolignic | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyroligneous |
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| pyrolusite | (noun) a mineral consisting of manganese dioxide; an important source of manganese | - |
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| pyrolysis | (noun) transformation of a substance produced by the action of heat | - |
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| pyrolytic | (adjective) resulting from pyrolysis | - |
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| pyromancer | (noun) one who practices pyromancy | - |
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| pyromancy | (noun) divination by fire or flames | - |
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| pyromania | (noun) an uncontrollable desire to set fire to things | - |
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| pyromaniac | (noun) a person with a mania for setting things on fire | - |
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| pyrometer | (noun) a thermometer designed to measure high temperatures | - |
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| pyromorphite | (noun) a mineral consisting of lead chloride and phosphate; a minor source of lead | Synonyms: green lead ore |
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| pyrope | (noun) a deep red garnet used as a gemstone | - |
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| pyrophobia | (noun) a morbid fear of fire | - |
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| pyrophosphate | (noun) a salt or ester of pyrophosphoric acid | - |
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| pyrophyllite | (noun) a white or greenish aluminum silicate mineral (resembles talc) | - |
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| pyroscope | (noun) a pyrometer that uses the color of the light emitted by a hot object | Synonyms: optical pyrometer |
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| pyrosis | (noun) a painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder | Synonyms: heartburn |
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| pyrostat | (noun) a thermostat that operates at very high temperatures | - |
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| pyrotechnic | (adjective) of or relating to the craft of making fireworks | Synonyms: pyrotechnical |
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| (adjective) suggestive of fireworks | - |
| (noun) (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc. | Synonyms: firework |
| pyrotechnical | (adjective) of or relating to the craft of making fireworks | Synonyms: pyrotechnic |
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| pyrotechnics | (noun) the craft of making fireworks | Synonyms: pyrotechny |
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| (noun) (music) brilliance of display (as in the performance of music) | - |
| pyrotechny | (noun) the craft of making fireworks | Synonyms: pyrotechnics |
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| pyroxene | (noun) any of a group of crystalline silicate mineral common in igneous and metamorphic rocks | - |
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| pyroxylin | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxyline |
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| pyroxyline | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxylin |
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| scammonyroot | (noun) tropical American prostrate or climbing herbaceous perennial having an enormous starchy root; sometimes held to be source of the sweet potato | Synonyms: Ipomoea fastigiata, Ipomoea panurata, man-of-the-earth, manroot, wild potato vine, wild sweet potato vine |
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| skyrocket | (noun) sends a firework display high into the sky | Synonyms: rocket |
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| (noun) propels bright light high in the sky, or used to propel a lifesaving line or harpoon | Synonyms: rocket |
| (verb) shoot up abruptly, like a rocket | Synonyms: rocket |
| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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| thyroglobulin | (noun) an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins | - |
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| thyroid | (adjective) suggestive of a thyroid disorder | - |
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| (adjective) of or relating to the thyroid gland | Synonyms: thyroidal |
| (noun) located near the base of the neck | Synonyms: thyroid gland |
| thyroidal | (adjective) of or relating to the thyroid gland | Synonyms: thyroid |
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| thyroidectomy | (noun) surgical removal of the thyroid gland | - |
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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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| thyromegaly | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, struma |
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| thyronine | (noun) a phenolic amino acid of which thyroxine is a derivative | - |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| thyrotoxic | (adjective) of or relating to or affected by hyperthyroidism | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| thyroxin | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxine |
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| thyroxine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxin |
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| tommyrot | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tosh, twaddle |
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| triiodothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: liothyronine, T |
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| tyro | (noun) someone new to a field or activity | Synonyms: beginner, initiate, novice, tiro |
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| tyrocidin | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidine |
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| tyrocidine | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidin |
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| tyrolean | (noun) soft green felt hat with a feather or brush cockade | Synonyms: tirolean |
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| tyrosine | (noun) an amino acid found in most proteins; a precursor of several hormones | - |
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| tyrosinemia | (noun) autosomal recessive defect in tyrosine metabolism resulting in liver and kidney disturbances and mental retardation | - |
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| tyrothricin | (noun) a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria | - |
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