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Physograde :: Physograde (n.) Any siphonophore which has an air sac for a float, as the Physalia..

Physaliae :: Physaliae (n. pl.) An order of Siphonophora which includes Physalia.

Physa :: Physa (n.) A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond..

Pneumonophora :: Pneumonophora (n. pl.) The division of Siphonophora which includes the Physalia and allied genera; -- called also Pneumatophorae.

Rorqual :: Rorqual (n.) A very large North Atlantic whalebone whale (Physalus antiquorum, or Balaenoptera physalus). It has a dorsal fin, and strong longitudinal folds on the throat and belly. Called also razorback..

Stavewood :: Stavesacre (n.) A kind of larkspur (Delphinium Staphysagria), and its seeds, which are violently purgative and emetic. They are used as a parasiticide, and in the East for poisoning fish..

Physalia :: Physalia (n.) A genus of large oceanic Siphonophora which includes the Portuguese man-of-war.

Alkekengi :: Alkekengi (n.) An herbaceous plant of the nightshade family (Physalis alkekengi) and its fruit, which is a well flavored berry, the size of a cherry, loosely inclosed in a enlarged leafy calyx; -- also called winter cherry, ground cherry, and strawberry tomato..

Pneumatocyst :: Pneumatocyst (n.) A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia..

Siphonophora :: Siphonophora (n. pl.) An order of pelagic Hydrozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which act as floats or as swimming organs, others as feeding or nutritive zooids, and others as reproductive zooids. See Illust. under Physallia, and Porpita..

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