What is the definition of autotroph?

Answer 1

Simple answer: an organism that doesnt need to feed off of other living things for food. They can make their own food from non living things like sunlight, water and gases

any organism capable of self-nourishment by using inorganic materials as a source of nutrients and using photosynthesis or chemosynthesis as a source of energy, as most plants and certain bacteria and protists.

or

An organism capable of synthesizing its own food from inorganic substances, using light or chemical energy. Green plants, algae, and certain bacteria are autotrophs.

they also transform light energy into chemical energy

Life Sciences & Allied Applications / botany of organisms such as green plants capable of manufacturing complex organic nutritive compounds from simple inorganic sources such as carbon dioxide, water, and nitrates, using energy from the sun

So basically orgasms that make their own food

Answer 2

An autotroph is an organism that can make its own food.