Muscle tone. Definition. noun. (1) The muscle in a steady partially contracted state caused by the successive flow of nerve impulses. (2) The amount of tension or resistance to movement in a muscle. Supplement. Muscle tone or tonus helps in maintaining body posture.
Hydronephrosis is the distention of the pelvis and calyces of one or both kidneys, resulting in thinning of the renal tubules because of obstructed urinary flow. When the obstruction is a stone or kink in one of the ureters, only one kidney is damaged.
1 The evaporation and subsequent collection of a liquid by condensation as a means of purification: the distillation of water. 2  The extraction of the volatile components of a mixture by the condensation and collection of the vapors that are produced as the mixture is heated: petroleum distillation.  A distillate.