2. Any vesicle or blister, especially if filled with air, or
a thin, watery fluid.
3. (Bot.) A distended, membranaceous pericarp.
4. Anything inflated, empty, or unsound. ``To swim with
bladders of philosophy.'' --Rochester.
{Bladder nut}, or {Bladder tree} (Bot.), a genus of plants
({Staphylea}) with bladderlike seed pods.
{Bladder pod} (Bot.), a genus of low herbs ({Vesicaria}) with
inflated seed pods.
{Bladdor senna} (Bot.), a genus of shrubs ({Colutea}), with
membranaceous, inflated pods.
{Bladder worm} (Zo["o]l.), the larva of any species of
tapeworm ({T[ae]nia}), found in the flesh or other parts
of animals. See {Measle}, {Cysticercus}.
{Bladder wrack} (Bot.), the common black rock weed of the
seacoast ({Fucus nodosus} and {F. vesiculosus}) -- called
also {bladder tangle}. See {Wrack}.