transferred. An arching roof or covering resembling a structure of this kind.

A vault or canopy like that of the sky.

transferred. The vaulted roof of a cavern or natural hollow; the concave vault of the sky; a vaulted canopy; a canopy of trees, etc.; a beehive.

used (frequently, with hyphen, attributive) to denote any structure which resembles (part of) an umbrella in shape.