photosynthesis

Plants absorb sunlight and turn that energy into food; the process is known as photosynthesis.

This is a compound word made up of photo (which means "light") and synthesis (which means "to put together"). Think of a synthesizer, which puts together different sounds to produce music. A plant uses light to put together chemical compounds and turn them into carbohydrates: food. Although the word can be used to describe any process that uses light to connect compounds, the word is almost always used to describe a plant's method of making food.

Definitions of photosynthesis
1

n synthesis of compounds with the aid of radiant energy (especially in plants)

Type of:
chemical action, chemical change, chemical process
(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

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