photo-, phot-, -photic +
(Greek: light; ultraviolet and infrared radiation; radiant energy)
holophote
1. A lamp with lenses or reflectors to collect the rays of light and throw them in a given direction; such as, those used in lighthouses.
2. An apparatus by which practically all the light from a lighthouse lamp or the like is thrown in a desired direction.
hyperphotesthesia
An increased sensitivity to light.
hypophotesthesia
A decreased sensitivity to light.
isophote, isophotic
A line (imaginary or in a diagram) connecting points where the brightness or the illumination is the same.
macrophotography
Photography in which objects are reproduced larger than or at their actual size but without the degree of magnification that use of a microscope would give.
niphotyphlosis
Snow blindness; irritation of the conjunctiva caused by reflection of the sun on the snow.
It is characterized by photophobia, blepharospasm, burning pain in the eyes, hyperemia, or temporary blindness.
orthophototropic
A descriptive reference to an orientation response towards light.
orthophototropism
An orientation response towards light.
phonophote
An electrical device for converting sound vibrations into light.
phonophotography
1. Photographic recording of the vibratory characteristics of speech sounds.
2. The recording on a moving photographic plate of the movements imparted to a diaphragm by sound waves.
phonophotoscope, phonophotoscopic
A device for showing the vibrations of sound; especially, of voice sounds photographically.
phot
A unit of illumination in the centimeter-gram-second system equal to one lumen per square centimeter.
photalgia
1. Light-induced pain, especially of the eyes.
2. Ocular pain caused by light; also, photodynia.
photallochromy
An allotropic change with color alteration due to light, as the change of yellow into red phosphorus.
Allotropism is the existence of a substance in two or more distinct forms with distinct physical properties; for example, graphite and diamond, allotropic forms of carbon.
photaugiaphobia
1. A pathological fear of light being directed upon the eyes.
2. An abnormal intolerance of light glare.
Etymologically related "light, shine, glow" word families:
ethero-;
fulg-;
luco-;
lumen-, lum-;
luna, luni-;
lustr-;
phengo-;
pheno-;
phospho-;
scinti-, scintill-;
splendo-.
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