The machine I believe you are referring to is called a "heart monitor" or ECG/EKG (Electro-Cardiogram) monitor and the medical term for "flat lined" is asystole (A-sis-tool-lee).
A defibrillator is a machine that is used to send strong electrical currents through two mental lined plates to help jump start a person's heart when they have flat lined.
That is called "misaligned" or "off-kilter" placement. It can cause readability issues and affect the overall appearance of the text.
The thin bony columns are called trabeculae - flat plates with a lattice-like network of thin, bony columns lined with endosteum.
inclined plane
English Tree lined road are usually wide Roads and are called Avenues.
An inclined plane is a simple machine that can be described as a flat surface that is slanted
a simple machine made of a flat sloping surface wrapped around a small rod. a simple machine made of a flat sloping surface wrapped around a small rod.
Geode
a sestet.
Alameda.
a Quatrain
Natural ones are called orifices. Artificial ones are called stomas.