halo

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Related to parhelion: sundog

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]

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 ?
WOLVERHAMPTON: 5.50 Forver's Girl, 6.20 Turf Time, 6.50 Gargano, 7.20 Parhelion, 7.50 Seldom, 8.20 Smarties Party, 8.50 Amical Risks.
Parhelion won six times over hurdles for Derek who served his time with the late and great Harry Wragg.
Beaubrav had no trouble following up his recent course win under top weight in the 1m5f handicap, with the fiveyear-old scoring in style by two and a half lengths from Parhelion.
NAOMI MATTHEW: 1.20 Headache, 1.50 Parhelion, 2.25 Wrighty Almighty, 3.00 Azlak (nap), 3.35 Ajjaadd, 4.10 Areeda (nb), 4.45 Sapphire Prince, 5.15 Knightfire.
Longshot Ed Quigley Parhelion (5.40 Wolverhampton) Derek Haydn Jones has a knack of rejuvenating horses who appear to have lost their way, and this previous courseand-distance winner can confirm that in a trappy affair.
"It's only taken me nine years to find out he stays!" There was also a close call in the following 1m4f handicap with Hel's Angel, ridden by Seb Sanders, holding on by a short head from Parhelion to give trainer Ann Duffield her first winner for 56 days.
Another of Johnston's recent winners, Manxman, will also be going hurdling with Murphy after making pounds 24,000, while Parhelion, who broke his duck in a Wolverhampton maiden last month, will head to Wales after being knocked down to Vaughan for pounds 35,000.
It could have been even better with Parhelion's late rally off a steady pace just failing against Beat Route and Thundering Home in the 1m3f handicap before Dettori held his hands up after Trachonitis just failed to make up the halfdozen lengths in the straight on all-the-way winner Jeer in the 1m4f handicap.
Parhelion 7.00 Kempton SP forecast 15-8 Failed to make it to the racecourse last season but has made up for lost time in two outings this term, building on his debut fifth at Lingfield to score a comfortable victory in a similar maiden event at Wolverhampton last time out (both 1m4f).
Others to follow Kempton 6.00 Sir Frank Wappat, 6.30 Manxman, 7.00 Parhelion, 7.30 Capricornus, 8.30 Nacho Libre.
Lingfield 1.50 Parhelion, 4.45 Nacho Libre, 5.15 Honest Broker.
The battle is best remembered for the appearance of a complete sun dog (also known as a parhelion) in the sky before the battle.