The Collaborative International Dictionary of English v.0.48:
Parathesis \Pa*rath"e*sis\, n.; pl. Paratheses. [NL., from Gr. ? a putting beside, from ? to put beside.] [1913 Webster] 1. (Gram.) The placing of two or more nouns in the same case; apposition. [1913 Webster] 2. (Rhet.) A parenthetical notice, usually of matter to be afterward expanded. --Smart. [1913 Webster] 3. (Print.) The matter contained within brackets. [1913 Webster] 4. (Eccl.) A commendatory prayer. --Shipley. [1913 Webster]