Action noun of the verb הִמְתִּין (himtín), from the root מ־ת־ן (m-t-n).
הַמְתָּנָה • (hamtaná) f (singular construct הַמְתָּנַת־) [pattern: הַקְטָלָה]
הַמַּתָּנָה • (hamataná) f