| accelerando | (noun) a gradually increasing tempo of music | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| bracelet | (noun) jewelry worn around the wrist for decoration | Synonyms: bangle |
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| (noun) a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist | Synonyms: watch bracelet, watchband, watchstrap, wristband |
| celebrant | (noun) an officiating priest celebrating the Eucharist | - |
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| (noun) a person who is celebrating | Synonyms: celebrater, celebrator |
| celebrater | (noun) a person who is celebrating | Synonyms: celebrant, celebrator |
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| celebration | (noun) any joyous diversion | Synonyms: festivity |
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| (noun) the public performance of a sacrament or solemn ceremony with all appropriate ritual | Synonyms: solemnisation, solemnization |
| (noun) a joyful occasion for special festivities to mark some happy event | Synonyms: jubilation |
| celebrator | (noun) a person who is celebrating | Synonyms: celebrant, celebrater |
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| celebrity | (noun) a widely known person | Synonyms: famous person |
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| (noun) the state or quality of being widely honored and acclaimed | Synonyms: fame, renown |
| celecoxib | (noun) a Cox-2 inhibitor (trade name Celebrex) that relieves pain and inflammation without harming the digestive tract | Synonyms: Celebrex |
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| celeriac | (noun) thickened edible aromatic root of a variety of celery plant | Synonyms: celery root |
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| (noun) grown for its thickened edible aromatic root | Synonyms: Apium graveolens rapaceum, celery root, knob celery, root celery, turnip-rooted celery |
| celerity | (noun) a rate that is rapid | Synonyms: quickness, rapidity, rapidness, speediness |
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| celery | (noun) stalks eaten raw or cooked or used as seasoning | - |
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| (noun) widely cultivated herb with aromatic leaf stalks that are eaten raw or cooked | Synonyms: Apium graveolens dulce, cultivated celery |
| celesta | (noun) a musical instrument consisting of graduated steel plates that are struck by hammers activated by a keyboard | - |
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| celestite | (noun) a mineral consisting of strontium sulphate | - |
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| colpocele | (noun) hernia projecting into the vagina | Synonyms: vaginocele |
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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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| 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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| deceleration | (noun) the act of decelerating; decreasing the speed | - |
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| (noun) a decrease in rate of change | Synonyms: retardation, slowing |
| (noun) (physics) a rate of decrease in velocity | - |
| defencelessness | (noun) the property of being helpless in the face of attack | Synonyms: defenselessness, unprotectedness |
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| encephalocele | (noun) protrusion of brain tissue through a congenital fissure in the skull | - |
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| galactocele | (noun) a cystic tumor containing milk or a milky substance (especially in the mammary glands) | - |
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| gracelessness | (noun) an unpleasant lack of grace in carriage or form or movement or expression | Synonyms: ungracefulness |
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| (noun) the inelegance of someone stiff and unrelaxed (as by embarrassment) | Synonyms: awkwardness, clumsiness, stiffness |
| 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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| 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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| hydrocele | (noun) disorder in which serous fluid accumulates in a body sac (especially in the scrotum) | - |
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| keratocele | (noun) hernia of the cornea | - |
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| lancelet | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: amphioxus |
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| laparocele | (noun) hernia through the abdomen | - |
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| meningocele | (noun) a congenital anomaly of the central nervous system in which a sac protruding from the brain or the spinal meninges contains cerebrospinal fluid (but no nerve tissue) | - |
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| myelomeningocele | (noun) a congenital defect of the central nervous system in which a sac containing part of the spinal cord and its meninges protrude through a gap in the vertebral column; frequently accompanied by hydrocephalus and mental retardation | - |
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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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| oscheocele | (noun) swelling of the scrotum | Synonyms: oscheocoele |
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| pricelessness | (noun) the positive quality of being precious and beyond value | Synonyms: invaluableness, preciousness, valuableness |
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| proaccelerin | (noun) a coagulation factor | Synonyms: accelerator factor, factor V, prothrombin accelerator |
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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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| rectocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: proctocele |
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| spermatocele | (noun) a swelling on the epididymis or the testis; usually contains spermatozoa | - |
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| tercelet | (noun) male hawk especially male peregrine or gyrfalcon | Synonyms: tercel, tiercel |
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| ureterocele | (noun) prolapse of the end of the ureter into the bladder; may obstruct urine flow | - |
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| urethrocele | (noun) prolapse of the urethra into the vagina | - |
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| urocele | (noun) extravasation of urine into the scrotal sac | - |
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| vaginocele | (noun) hernia projecting into the vagina | Synonyms: colpocele |
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| varicocele | (noun) dilatation of the veins associated with the spermatic cord in the testes | - |
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| voicelessness | (noun) having no voice in the management or control of affairs | - |
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| (noun) speaking softly without vibration of the vocal cords | Synonyms: susurration, whisper, whispering |
| (noun) (phonetics, of a consonant) The property of being spoken without vibration of the vocal cords, as [t], [s], or [f]. | - |
| (noun) a disorder of the vocal organs that results in the loss of voice | Synonyms: aphonia |