n.[動]氣胞囊；[植]呼吸根
Pneumatophore (aerophore；breathing root) A specialized negatively geotropic root produced by certain aquatic vascular plants(especially trees such as mangroves , e.g. 呼吸根：指由某種水生維管植物產(chǎn)生的特化的負向地性根（尤其如紅樹，如海桑屬），在土壤之上生長良好。
pneumatophor 救生氧氣袋
