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.
diÂ·laÂ·tion. n. 1. a. The act of expanding or enlarging or the state of being expanded or enlarged: dilation of the cervix during labor. b. The condition of being abnormally expanded or enlarged, as of an organ, orifice, or tubular structure in the body. 2.