you dont need to know this
Photo itself is the root word, meaning light.
Lum is the root word. This root word means light or bright.
Light.
The prefix is "photo-" meaning light. The root is "-phobia" meaning fear or aversion. The word "photophobia" refers to an abnormal sensitivity to light.
light
The root "lit" or "liter" pertains to light. It is derived from the Latin word "lux" meaning light. Words such as "illuminate" and "literate" are based on this root.
The root word "rad" comes from the Latin word "radius," meaning "spoke of a wheel" or "ray of light."
The Greek syllable 'phot-' is the root of the Greek noun phos. The root word 'phos' is Greek for 'light' in English. The root word copia is Latin for 'abundance' in English. The English derivative is 'copy'.
The root word "etom" does not have a specific meaning in English. It is not a common root word in the English language.
Arthr
The meaning of the root word counter is 'against'.
The root word "photo" in "photoautotroph" likely refers to light. Therefore, a photoautotroph is an organism that can produce its own food using light as an energy source.