halo


Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.

halo

 [ha´lo]
a circular structure, such as a luminous circle seen surrounding an object or light.
Fick's halo a colored circle appearing around a light, experienced by wearers of contact lenses.
halo glaucomato´sus (glaucomatous halo) a narrow light zone surrounding the optic disk in glaucoma.
senile halo a zone of variable width around the optic disk, due to exposure of various elements of the choroid as a result of senile atrophy of the pigmented epithelium.

ha·lo

(hā'lō),
1. A reddish yellow ring surrounding the optic disc, due to a widening of the scleral ring making the deeper structures visible.
2. An anular flare of light surrounding a luminous body or a depigmented ring around a mole.
3. Synonym(s): areola (4)
4. A circular metal band used in a halo cast or halo brace, attached to the skull with pins.
[G. halōs, threshing floor on which oxen trod a circle; the halo round the sun or moon]

halo

/ha·lo/ (ha´lo)
1. a luminous or colored circle, as the colored circle seen around a light in glaucoma.
2. a ring seen around the macula lutea in ophthalmoscopic examinations.
3. the imprint of the ciliary processes on the vitreous body.
4. a metal or plastic band that encircles the head or neck, providing support and stability to an orthosis.

Fick's halo  a colored circle appearing around a light due to the wearing of contact lenses.
halo glaucomato´sus , glaucomatous halo peripapillary atrophy seen in severe or chronic glaucoma.
senile halo  a zone of variable width around the optic papilla, due to exposure of various elements of the choroid as a result of senile atrophy of the pigmented epithelium.

ha·lo

(hā'lō)
1. A reddish yellow ring surrounding the optic disc, due to a widening of the scleral ring making the deeper structures visible.
2. An anular flare of light surrounding a luminous body or a depigmented ring around a mole.
See: halo nevus
3. Synonym(s): areola (4) .
4. A circular metal band used in a halo cast or halo brace, attached to the skull with pins.
[G. halōs, threshing floor on which oxen trod a circle; the halo round the sun or moon]

halo

A coloured ring of light seen around a light source as a result of aberrations, internal reflections, diffraction or scattering. It also appears when the eye is diseased and the cornea is oedematous, as in glaucoma.
References in periodicals archive ?
Lee and Barry have proven track records of growing and improving companies in the pharmaceutical and CDMO sector," said Aaron Davenport, chairman, Halo Pharmaceutical, and managing director, SK Capital, Halo's majority owner.
Andromeda's thinning halo suggests that the galaxy is evolving from a once vibrant stellar nursery to one that's more sedate.
Colter's comments has led to speculation that Halo 5's campaign may be split across two characters similar to Halo 2, which saw playtime split between Master Chief and the Arbiter.
Bonnie Ross, the studio head of 343 Industries, said alongside the Halo 5 announcement the studio has special plans in store for Halo fans.
Should you have any questions, please contact your local HALO representative or the HALO Sales and Marketing team nearest you.
The Swipe Halo Value+ has a 3000mAH battery, and comes with an integrated FM radio and stereo speakers.
The Halo uses a patented system that mounts directly onto a standard A2 or A1 flash hider.
Halo 4 marks the beginning of a new trilogy in the franchise starring the hero who started it all - Master Chief.
Comparing the Halo to the Clarity Aloft, the Clarity Aloft seems more robust at first glance, but in real life, the Halo has been a stellar performer.
The flavour of the game and the way it is primarily played may not have changed too much but there is enough subtlety present for even the most hardcore Halo fans to recognise differences and on the whole these differences are a big improvement.
Company aligns HP Halo unit within HP ProCurve Networking business HP today announced a service enabling HP Halo customers to use their telepresence endpoints to reach thousands of people, including employees, partners and suppliers, at one time.
Set before Halo 1, you lead the crew through initial skirmishes to an all-out war against the evil beggars in, what has to be said, is a well designed, slick-playing RTS title, Halo or no Halo.