I. ¦mänə¦klōn ə l, ¦mōn- adjective
Etymology: mon- + clone + -al
: produced by, being, or composed of cells derived from a single cell
a monoclonal tumor
especially : relating to or being an antibody derived from a single cell in large quantities for use against a specific antigen (as a cancer cell)
II. noun
( -s )
: a monoclonal antibody