Definition of sessile barnacle
: a barnacle (such as the acorn barnacle) of which the calcareous shell is attached directly to the substrate — compare pedunculate barnacle
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“Sessile barnacle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sessile%20barnacle. Accessed 22 Jun. 2021.
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