urinary bladder🔊noun1Anatomy, Medicine, Sciences An elastic, muscular sac situated in the pelvic cavity, into which urine from the kidneys is temporarily stored prior to disposal by urination. Urine enters the bladder via the ureters and exits via the urethra.Synonymsbladder, cystis urinaria, urocyst, urocystis, vesica, vesica urinariaHypernymsbladderHolonymsurinary tract