In immunochemistry, pertaining to proteins ( i.e., antibodies) from more than a single clone of cells, in contradistinction to monoclonal.
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poly·clo·nal 'päl-i-.klōn-əl adj produced by or being cells derived from two or more cells of different ancestry or genetic constitution <\polyclonal antibody synthesis>
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poly·clo·nal (pol″e-kloґnəl) 1. derived from different cells. 2. of or pertaining to multiple clones. Cf. monoclonal and oligoclonal.Medical dictionary. 2011.