I. deca·me·ter ˈde-kə-ˌmē-tər noun
Etymology: French décamètre, from déca- + mètre meter
Date: 1810
: dekameter
II. de·cam·e·ter de-ˈka-mə-tər, də- noun
Etymology: Greek dekametron, from deka- + metron measure, meter
Date: 1821
: a line of verse consisting of 10 metrical feet