# acorn barnacle

> English word · Noun

## Definitions
1. Any of several species of stalkless barnacles in the genus Balanus.
2. Any barnacle in the order Sessilia.

## Etymology
From its shape.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/acorn-barnacle