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