Definitions
1.nounA structure that bars passage.
2.nounAn obstacle or impediment.
3.nounA boundary or limit.
4.noun(grammar) A node (in government and binding theory) said to intervene between other nodes A and B if it is a potential governor for B, c-commands B, and does not c-command A.
5.nounA separation between two areas of the body where specialized cells allow the entry of certain substances but prevent the entry of others.
6.nounThe lists in a tournament.
7.noun(in the plural) A martial exercise of the 15th and 16th centuries.
8.verbTo block or obstruct with a barrier.