pocházejícího
pocházejícího is the genitive singular masculine/neuter form of the present active participle of the Czech verb pocházet. Pocházet means "to come from," "to originate from," or "to stem from." Therefore, pocházejícího is used to indicate possession, origin, or relationship in the genitive case for a masculine or neuter noun that is performing the action of originating.
For example, if you were to say "the book originating from the library," in Czech it would
The use of the genitive case after prepositions like "z" (from) is common in Czech, and the