All by-product antonyms
by-prod·uct
B b noun by-product
- source — any thing or place from which something comes, arises, or is obtained; origin: Which foods are sources of calcium?
- cause — a person or thing that acts, happens, or exists in such a way that some specific thing happens as a result; the producer of an effect: You have been the cause of much anxiety. What was the cause of the accident?
- origin — something from which anything arises or is derived; source; fountainhead: to follow a stream to its origin.