(idiomatic) Often in the phrase on cloud nine: a state of bliss, elation or happiness. / (idiomatic, possibly nonstandard) A state of fantastic or impractical dreaming or thinking.

(figuratively, usually with have or with) Used to indicate that a person is distracted or disconnected from the present situation.

(property law) An encumbrance or claim on a title (ownership) to real property sufficient to interfere with title transfer until the problem has been resolved.

Alternative spelling of thundercloud

A series of points in three-dimensional space that collectively describe the geometry of a physical object.

(idiomatic) Whose future is uncertain due to an anticipated threat or change in circumstance. / (idiomatic) Under suspicion; subject to critical inspection.

(astronomy) Either of two irregular galaxies that are close companions of our Milky Way galaxy.

(astronomy) A large and relatively dense cloud of cold gas and dust in interstellar space from which new stars are formed

(idiomatic) In a state of elation; very happy; blissful.

The altitude of the base of a mass of cloud; measured by a ceilometer.