IPA: /ˌɔːtəʊˈtrɒfɪkli/
KK: /ɔːtəʊˈtrɒfɪkli/
In a way that relates to organisms that produce their own food from inorganic substances.
Plants grow autotrophically by using sunlight to convert carbon dioxide and water into glucose.
Autotrophically → It is formed from "auto-" (meaning self) and "trophē" (from Greek, meaning nourishment or feeding) and the suffix "-ically" (meaning in a manner). The word describes the manner in which an organism nourishes itself by producing its own food, typically through photosynthesis or chemosynthesis.
Think of 'self' ('auto-') providing its own 'nourishment' ('trophē') — that's how autotrophically describes organisms that feed themselves.