SERPULA, ser'p[=u]-la, _n._ a genus of sedentary Chætopod worms, living in
twisted calcareous tubes fastened to shells and rocks in the sea, or even
to other animals, such as crabs.--_adj._ SERP[=U]'LIAN.--_n._ SER'PULITE, a
fossil of the family _Serpulidæ_.--_adjs._ SERPULIT'IC, SER'PULOID. [L.
_serp[)e]re_, to creep.]
SERR, ser, _v.t._ (_obs._) to crowd or press together.