adj \-ˈthrē\

Definition of OMEGA-3

: being or composed of polyunsaturated fatty acids in which the first double bond in the hydrocarbon chain occurs between the third and fourth carbon atoms from the end of the molecule most distant from the carboxylic acid group and which are found especially in fish (as tuna and salmon), fish oils, green leafy vegetables, and some vegetable oils
omega–3 noun

Seen & Heard

What made you want to look up omega-3? Please tell us where you read or heard it (including the quote, if possible).