a hole drilled or bored into the earth to obtain water, petroleum, natural gas, brine, or sulfur.

a spring or natural source of water.

an apparent reservoir or a source of human feelings, emotions, energy, etc.

He was a well of gentleness and courtesy.

a container, receptacle, or reservoir for a liquid

the well of ink in a fountain pen.

any sunken or deep, enclosed space, as a shaft for air or light, stairs, or an elevator, extending vertically through the floors of a building.

Nautical .

a part of a weather deck between two superstructures, extending from one side of a vessel to the other.

a compartment or enclosure around a ship's pumps to make them easily accessible and protect them from being damaged by the cargo.

a hollow compartment, recessed area, or depression for holding a specific item or items, as fish in the bottom of a boat or the retracted wheels of an airplane in flight.

any shaft dug or bored into the earth, as for storage space or a mine.

to rise, spring, or gush, as water, from the earth or some other source (often fol. by up, out, or forth )

Tears welled up in my eyes.

to send welling up or forth

a fountain welling its pure water.

like, of, resembling, from, or used in connection with a well.