Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
As the explains, biofoul is "an accumulation of microorganisms, plants, algae, or small animal," and the concern is that it can introduce invasive species to new habitats and interfere with the native species there.
Source: https://www.newser.com/story/329795/800-cruise-passengers-stranded-due-to-biofoul.html