photon

1. A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.

2. The quantum of electromagnetic energy, regarded as a discrete particle having zero mass, no electric charge, and an indefinitely long lifetime. See Table at subatomic particle.

3. A unit of intensity of light at the retina equal to the illumination received per square millimeter of a pupillary area from a surface having a brightness of one candle per square meter.

4. A quantum of electromagnetic radiation.

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Top Words by points	Points	Word Game
photon	11	Scrabble

2 Letters	Scrabble® Points
ho	5
po	4
op	4
to	2
no	2
on	2
oh	5

3 Letters	Scrabble® Points
opt	5
hon	6
pho	8
pht	8
poh	8
poo	5
pot	5
tho	6
ton	3
too	3
top	5
ooh	6
oot	3
ono	3
oho	6
nth	6
not	3
noo	3
noh	6
hoo	6
hop	8
hot	6

4 Letters	Scrabble® Points
topo	6
toph	9
toon	4
hoop	9
hoot	7
poon	6
pooh	9
phot	9
phon	9
onto	4

5 Letters	Scrabble® Points
photo	10
phono	10

6 Letters	Scrabble® Points
photon	11