​A narrowing of a passageway that interferes with the movement of substances through its interior

A) ​anuria
B) ​calculi
C) ​calyx
D) ​cystitis
E) ​dysuria
F) ​fistula
G) ​graft
H) ​lithotripsy
I) ​nephron
J) ​oliguria
K) ​peritoneal
L) ​ptosis
M) ​residual
N) ​secretion
O) ​stricture
P) ​ureter
Q) ​urethra
R) ​urinary meatus

Stricture

The narrowing of an opening, tube, or canal, such as the urethra or esophagus.

Passageway

A route or path that allows access from one place to another, often used in the context of anatomical structures or buildings.

Movement

The act or process of changing physical location or position by people or objects.