con·ven·ti·cle 
(kən-vĕntĭ-kəl)
(kən-vĕntĭ-kəl)n.
1. A religious meeting, especially a secret or illegal one, such as those held by Dissenters in England and Scotland in the 16th and 17th centuries.
2. The place where such a meeting is held.
[Middle English, from Latin conventiculum, meeting, diminutive of conventus, assembly; see CONVENT.]
con·venti·cler n.