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Heron (Noun)

Grey or white wading bird with long neck and long legs and (usually) long bill.

Nouns denoting animals.

The heron stood motionless in the shallow water, scanning the surface for fish.
A grey heron waded through the marsh, its long legs sinking slowly into the mud.
The heron's long bill snapped shut just inches from the water's surface, missing its prey by a fraction of a second.
As the sun rose over the lake, a white heron took to the skies, its wings beating slowly as it soared overhead.
In the stillness of the morning, a heron stalked its prey, its long neck bent low as it crept through the reeds.

Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century).

Nouns denoting people.

Heron of Alexandria, a Greek mathematician and inventor, devised a way to determine the area of a triangle using a formula that bears his name.
The heron, a bird known for its slender neck and legs, was not the focus of Heron's work, but rather his mathematical and mechanical inventions.
Heron's most famous invention was the aeolipile, a primitive steam engine that was the precursor to modern steam power.
In his book "Metrica", Heron described a method for calculating the area of a triangle using its side lengths, a formula that is still used today.
Heron's work on mechanical devices, including the heron's fountain, a device that used compressed air to create a jet of water, was well ahead of its time.