fil·i·bus·ter 
(fĭlə-bŭs′tər)
(fĭlə-bŭs′tər)n.
1.
a. The obstructing or delaying of legislative action, especially by prolonged speechmaking.
b. An instance of this, especially a prolonged speech.
2. An adventurer who engages in a private military action in a foreign country.
v. fil·i·bus·tered, fil·i·bus·ter·ing, fil·i·bus·ters
v.intr.
1. To obstruct or delay legislative action, especially by making prolonged speeches.
2. To take part in a private military action in a foreign country.
v.tr.
To use a filibuster against (a legislative measure, for example).
[From Spanish filibustero, freebooter, from French flibustier, from Dutch vrijbuiter, pirate; see FREEBOOTER.]
fili·bus′ter·er n.