defocus

As an adjective blurry

is (of an image) not clear, crisp, or focused; having fuzzy edges.

As a verb defocus is

to deliberately cause a lens, or a beam of light or particles, to be out of focus.

As verbs the difference between defocus and unfocus

is that defocus is to deliberately cause a lens, or a beam of light or particles, to be out of focus while unfocus is to bring out of focus.

As verbs the difference between defocus and blur

is that defocus is to deliberately cause a lens, or a beam of light or particles, to be out of focus while blur is to make indistinct or hazy, to obscure or dim.

As a noun blur is

a smear, smudge or blot.

As verbs the difference between refocus and defocus

is that refocus is to focus on something else while defocus is to deliberately cause a lens, or a beam of light or particles, to be out of focus.

As verbs the difference between focus and defocus

is that focus is to cause (rays of light, etc) to converge at a single point while defocus is to deliberately cause a lens, or a beam of light or particles, to be out of focus.

As a noun focus

is a point at which reflected or refracted rays of light converge.

As a noun particle

is a very small piece of matter, a fragment; especially, the smallest possible part of something.

As a verb defocus is

to deliberately cause a lens, or a beam of light or particles, to be out of focus.

As verbs the difference between light and defocus

is that light is to start (a fire) while defocus is to deliberately cause a lens, or a beam of light or particles, to be out of focus.

As a noun light

is the natural medium emanating from the Sun and other very hot sources (now recognised as electromagnetic radiation with a wavelength of 400-750 nm), within which vision is possible.

As an adjective light

is having light.

As an adverb light

is carrying little.

As a proper noun Light

is {{surname|lang=en}.

As verbs the difference between beam and defocus

is that beam is to emit beams of light; shine; radiate while defocus is to deliberately cause a lens, or a beam of light or particles, to be out of focus.

As a noun beam

is any large piece of timber or iron long in proportion to its thickness, and prepared for use.