What Does “A Colony of Barnacles” Mean?
“Colony” is the collective noun for a group of barnacles, and it’s one of the most literally accurate terms on this site. Barnacles hatch as free-swimming larvae, drift with the plankton for a while, and then settle head-first onto a hard surface, rock, dock piling, boat hull, even a whale’s skin, where they cement themselves permanently in place, packed in tight beside countless others of their kind.
Once attached, a barnacle never moves again. It spends the rest of its life filter-feeding with feathery, comb-like appendages called cirri, sweeping them through the water to catch plankton. That permanent, densely packed group living is exactly what “colony” describes, so unlike some collective nouns that are borrowed or whimsical, this one is a straightforward biological fact.
Example: “A colony of barnacles covered nearly every inch of the old dock piling.”
Related: Collective Nouns for Crustaceans · What Is a Group of Barnacles Called?