filibuster
Pronunciation: 'fi-l&-"b&s-t&r
Function: noun
Etymology: Spanish filibustero, literally, freebooter
1 : an irregular military adventurer; specifically : an American engaged in fomenting insurrections in Latin America in the mid-19th century
2 [2filibuster]
a : the use of extreme dilatory tactics in an attempt to delay or prevent action especially in a legislative assembly
b : an instance of this practice

(from ST)