ScienceAugust 23, 2026
branchial
BRANG-kee-uhl
Definition
Relating to or located in the area of the gills.
Etymology
Derived from the Greek word 'brankhia,' meaning 'gills,' which entered English through New Latin in the early 19th century.
In the news
The article uses the term to identify the two 'branchial hearts' that pump oxygen-poor blood through the octopus's gills before it reaches the main systemic heart.
An octopus has three hearts, but during jet-propelled swimming its main systemic heart can briefly stop—the pressure inside its mantle prevents enough blood from returning to the hearts. That helps explain why bottom-dwelling octopuses usually crawl and re
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