A pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ. (noun)
Examples of word cyst
Assuming the cyst is a warning sign that he will soon meet his maker, he is determined to do two things before he dies; he needs to regain what he believes he let slide; his ties to his wife and his estranged grandson Daniel, an Alaskan fisherman running away from home since his parents died years ago.
And there's another stage, which we call the cyst phase, where they go to sleep.
Pull your head out of your ass, the anal cyst is cutting off the flow of blood to your brain.
An anal cyst is usually an infected pore that is on the anus itself.
When I was hit by a drunk driver in 2000, I had doctors working on my shoulder and upper back (my cyst is on or near the base of my spine), and I generally got the impression that "science isn't really an exact science for these science types," to paraphrase Twelve Monkeys.