Webster's English Dictionary

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pneumatophore

pneu.mato.phore \n(y)u.-'mat-*-.fo-(*)r, -.fo.(*)r\ 
   \n(y)u.-.mat-*-'fo.r-ik, -'fa:r-\ n [ISV] 1: a muscular gas-containing sac 
   that serves as a float on a siphonophore c olony 2: a root often 
   functioning as a respiratory organ in a marsh plant  - pneu.mato.phor.ic aj