Broad circular downwarped structures are called "basins" or "sedimentary basins." These geological formations occur when the Earth's crust is depressed due to tectonic forces, leading to the accumulation of sediments. They often serve as important sites for Natural Resources, such as oil and gas.
A shield volcano
If it's a broad, long knife it is called a 'panga'
A broad bundle of light rays is called a beam.
The study of how things work is called engineering. Engineering is a broad discipline that involves applying scientific and mathematical principles to design and create systems, structures, and technological solutions to various problems.
A machete is a broad heavy knife.
The largest of the ovarian attachments is called the broad ligament. It is a double fold of peritoneum that helps to support and anchor the ovaries.
Parliament House or Sansad Bhawan is a circular structure supported by 144 pillars with a broad corridor.
It is called a plain.
Seals have flippers while fish have fins. They are derived from the same structures but used by different classifications.
Broad beans are called avaraikai in Tamil.
The omental sling in ruminants, the broad ligaments of the uterus and the root of the mesentery.
The broad overall topic for a piece of literature is known as the "theme".