Yes. A line segment is a line with two points at both ends of it.
Rectum
I believe what you're looking for is called a secant, although it can also be a line, not just a segment.
The rectum, that final (generally) straight length of the large intestine, ends at the anal opening or anus. A link is provided below.
The lowest segment of the large intestine is the anal canal.
The latus rectum of a parabola is a segment with endpoints on the parabola passing through the focus and parallel to the directrix.
The radius of a circle is a line segment joining any point of the boundary of the circle to its centre. A diameter is a line segment from a point of the boundary of the circle which passes through the centre and ends at the boundary on the opposite side.
It is a decimal that terminates.
Any rational number terminates.
The cecum is the pocket like initial segment of the internal organ, where it interfaces with the small digestive tract, while the rectum is the last part of the digestive organ, answerable for putting away stool before it is ousted from the body through the rear-end
"Lines" is the plural of "line" which is a series of points each of which is contiguous only to two other points in the series. It is also used to describe a line segment which is a line which terminates at each end with a point.
Distal sigmoid colon is the last segment of your colon before the rectum begins. The colon segments (in order from proximal to distal) are: ascending, transverse, descending, sigmoid.