Definition of pneumatophore
1
: a muscular gas-containing sac that serves as a float on a siphonophore colony
2
: a usually partially exposed root of a wetland plant (such as a mangrove) that functions especially in the intake of oxygen from the atmosphere
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Merriam-Webster unabridged
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Time Traveler for pneumatophore
The first known use of pneumatophore was in 1859
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