blood gill

noun

: one of the thin-walled fimbriated blood-filled evaginations more or less completely free from tracheae that are characteristic of certain chiefly aquatic insects and may be concerned with respiratory or osmotic activity

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“Blood gill.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blood%20gill. Accessed 21 Mar. 2023.

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