| macrocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: megacephaly, megalocephaly |
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| marginocephalian | (noun) includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs | Synonyms: Marginocephalia, suborder Marginocephalia |
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| marshal | (noun) a law officer having duties similar to those of a sheriff in carrying out the judgments of a court of law | Synonyms: marshall |
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| (noun) (in some countries) a military officer of highest rank | Synonyms: marshall |
| (verb) make ready for action or use | Synonyms: mobilise, mobilize, summon |
| (verb) arrange in logical order | - |
| (verb) place in proper rank | - |
| (verb) lead ceremoniously, as in a procession | - |
| marshall | (noun) a law officer having duties similar to those of a sheriff in carrying out the judgments of a court of law | Synonyms: marshal |
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| (noun) (in some countries) a military officer of highest rank | Synonyms: marshal |
| marshalship | (noun) the post of marshall | - |
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| matriarchal | (adjective) characteristic of a matriarchy | - |
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| megacephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megalocephaly |
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| megalocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megacephaly |
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| melphalan | (noun) antineoplastic drug (trade name Alkeran) used to treat multiple myeloma and some other malignancies | Synonyms: Alkeran |
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| meningoencephalitis | (noun) inflammation of the brain and spinal cord and their meninges | Synonyms: cerebromeningitis, encephalomeningitis |
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| mesencephalon | (noun) the middle portion of the brain | Synonyms: midbrain |
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| metencephalon | (noun) the part of the hindbrain that develops into the pons and the cerebellum | - |
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| microcephalic | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalous, nanocephalic |
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| microcephalous | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalic, nanocephalic |
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| microcephalus | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephaly, nanocephaly |
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| microcephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, nanocephaly |
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| microphallus | (noun) an abnormally small penis | Synonyms: micropenis |
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| monarchal | (adjective) having the characteristics of or befitting or worthy of a monarch | Synonyms: monarchical |
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| (adjective) ruled by or having the supreme power resting with a monarch | Synonyms: monarchic, monarchical |
| morphallaxis | (noun) regeneration on a reduced scale of a body part; observed especially in invertebrates such as certain lobsters | - |
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| myelencephalon | (noun) the posterior part of the hindbrain in developing vertebrates; forms the medulla oblongata in adults | - |
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| nanocephalic | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalic, microcephalous |
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| nanocephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, microcephaly |
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| nanophthalmos | (noun) condition in which both eyes are abnormally small but otherwise normal | - |
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| naphthalene | (noun) a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs | - |
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| narwhal | (noun) small Arctic whale the male having a long spiral ivory tusk | Synonyms: Monodon monoceros, narwal, narwhale |
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| narwhale | (noun) small Arctic whale the male having a long spiral ivory tusk | Synonyms: Monodon monoceros, narwal, narwhal |
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| neanderthal | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neandertal, oafish, swinish |
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| neencephalon | (noun) the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts | Synonyms: neoencephalon |
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| neoencephalon | (noun) the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts | Synonyms: neencephalon |
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| nonchalance | (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: indifference, unconcern |
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| nonchalant | (adjective) marked by blithe unconcern | Synonyms: casual, insouciant |
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| nonchalantly | (adverb) in an unconcerned manner | Synonyms: casually |
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| (adverb) in a composed and unconcerned manner | Synonyms: coolly, nervelessly |
| nonlethal | (adjective) not capable of causing death | - |
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| nymphalid | (noun) medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast | Synonyms: brush-footed butterfly, four-footed butterfly, nymphalid butterfly |
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| omphalocele | (noun) protrusion of the intestine and omentum through a hernia in the abdominal wall near the navel; usually self correcting after birth | Synonyms: umbilical hernia |
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| omphalos | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalus, umbilicus |
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| omphaloskepsis | (noun) literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption | Synonyms: navel-gazing |
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| omphalus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, umbilicus |
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| ophthalmectomy | (noun) surgical removal of an eye | - |
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| ophthalmia | (noun) severe conjunctivitis | Synonyms: ophthalmitis |
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| ophthalmic | (adjective) of or relating to ophthalmology | - |
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| (adjective) of or relating to or resembling the eye | Synonyms: ocular, optic, optical |
| ophthalmitis | (noun) severe conjunctivitis | Synonyms: ophthalmia |
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| ophthalmologist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, oculist |
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| ophthalmology | (noun) the branch of medicine concerned with the eye and its diseases | - |
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| ophthalmoplegia | (noun) paralysis of the motor nerves of the eye | - |
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| ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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| ophthalmoscopy | (noun) examination of the interior of an eye using an ophthalmoscope | - |
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| oxycephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: acrocephaly |
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| pachycephalosaur | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaurus |
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| pachycephalosaurus | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaur |
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| palaeencephalon | (noun) the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex | Synonyms: paleencephalon, paleoencephalon |
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| paleencephalon | (noun) the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex | Synonyms: palaeencephalon, paleoencephalon |
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| paleoencephalon | (noun) the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex | Synonyms: palaeencephalon, paleencephalon |
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| panencephalitis | (noun) diffuse inflammation of the entire brain | - |
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| paschal | (adjective) of or relating to Passover or Easter | - |
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| patriarchal | (adjective) characteristic of a form of social organization in which the male is the family head and title is traced through the male line | - |
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| (adjective) relating to or characteristic of a man who is older or higher in rank | - |
| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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| phalangeal | (adjective) of or relating to the bones of the fingers or toes | - |
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| phalanger | (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: opossum, possum |
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| phalangist | (noun) a Spanish member of General Franco's political party | Synonyms: falangist |
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| phalangitis | (noun) inflammation of a finger or toe | - |
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| phalanx | (noun) any of the bones of the fingers or toes | - |
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| (noun) a body of troops in close array | - |
| (noun) any closely ranked crowd of people | - |
| phalarope | (noun) small sandpiper-like shorebird having lobate toes and being good swimmers; breed in the Arctic and winter in the tropics | - |
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| phallic | (adjective) relating to a phallus especially as an embodiment of generative power | - |
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| (adjective) resembling or being a phallus | Synonyms: priapic |
| phalloidin | (noun) one of a group of toxins from the death cap (Amanita phalloides) known as phallotoxins. | - |
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| phalloplasty | (noun) reconstructive surgery on the penis to repair congenital abnormality or injury | - |
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| phallus | (noun) the male sex organ | Synonyms: member, penis |
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| phalsa | (noun) drought-resistant Asiatic treelike shrub bearing pleasantly acid small red edible fruits commonly used in sherbets | Synonyms: Grewia asiatica |
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| phenolphthalein | (noun) a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8 | - |
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| plagiocephaly | (noun) congenital malformation of the skull in which the main axis of the skull is oblique | - |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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| pneumoencephalogram | (noun) an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast | Synonyms: encephalogram |
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| prosencephalon | (noun) the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube | Synonyms: forebrain |
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| prothalamion | (noun) a song in celebration of a marriage | Synonyms: prothalamium |
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| prothalamium | (noun) a song in celebration of a marriage | Synonyms: prothalamion |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| resorcinolphthalein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluoresceine, fluorescent dye |
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| rhinencephalon | (noun) a center in the cerebral hemispheres that governs the sense of smell in lower animals; in humans it seems to mediate complex emotional behavior | Synonyms: olfactory brain |
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| rhombencephalon | (noun) the posterior portion of the brain including cerebellum and brainstem | Synonyms: hindbrain |
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| ringhals | (noun) highly venomous snake of southern Africa able to spit venom up to seven feet | Synonyms: Hemachatus haemachatus, rinkhals, spitting snake |
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| rinkhals | (noun) highly venomous snake of southern Africa able to spit venom up to seven feet | Synonyms: Hemachatus haemachatus, ringhals, spitting snake |
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| scaphocephaly | (noun) congenital malformation of the skull which is long and narrow; frequently accompanied by mental retardation | - |
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| seneschal | (noun) the chief steward or butler of a great household | Synonyms: major-domo |
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| shale | (noun) a sedimentary rock formed by the deposition of successive layers of clay | - |
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| shallon | (noun) small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries | Synonyms: Gaultheria shallon, salal |
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| shallot | (noun) small mild-flavored onion-like or garlic-like clustered bulbs used for seasoning | - |
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| (noun) type of onion plant producing small clustered mild-flavored bulbs used as seasoning | Synonyms: Allium ascalonicum, Allium cepa aggregatum, eschalot, multiplier onion |
| (noun) aggregate bulb of the multiplier onion | - |
| shallow | (adjective) lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center | - |
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| (adjective) not deep or strong; not affecting one deeply | - |
| (adjective) lacking depth of intellect or knowledge; concerned only with what is obvious | - |
| (noun) a stretch of shallow water | Synonyms: shoal |
| (verb) become shallow | Synonyms: shoal |
| (verb) make shallow | Synonyms: shoal |
| shallowly | (adverb) in a shallow manner | - |
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| shallowness | (noun) the quality of lacking physical depth | - |
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| (noun) lack of depth of knowledge or thought or feeling | Synonyms: superficiality |
| shallu | (noun) sorghum having slender dry stalks and small hard grains; introduced into United States from India | Synonyms: Sorghum vulgare rosburghii |
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| shalwar | (noun) a pair of light loose trousers with a tight fit around the ankles; worn by women from the Indian subcontinent (usually with a kameez) | Synonyms: salwar |
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| shillyshally | (noun) the act of procrastinating; putting off or delaying or deferring an action to a later time | Synonyms: cunctation, procrastination |
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| (verb) be uncertain and vague | - |
| (verb) postpone doing what one should be doing | Synonyms: dilly-dally, dillydally, drag one's feet, drag one's heels, procrastinate, stall |
| sphalerite | (noun) an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form | Synonyms: blende, zinc blende |
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| stomachal | (adjective) relating to or involving the stomach | Synonyms: gastric, stomachic |
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| subthalamus | (noun) the ventral part of the thalamus | - |
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| telencephalon | (noun) the anterior division of the forebrain; the cerebrum and related parts of the hypothalamus | - |
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| tetrahalide | (noun) any halide containing four halogen atoms in its molecules | - |
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| thalamocortical | (adjective) relating to or connecting the cortex and thalamus | - |
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| thalamus | (noun) large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon | - |
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| thalassaemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassemia |
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