A high military officer in a warlike nation. / A local ruler or bandit leader usually where the government is weak.

plural of army boot

Initialism of Product Data Management. / (signal processing) Initialism of pulse-duration modulation. / (signal processing) Initialism of pulse-density modulation.

(organic chemistry) A polycyclic aromatic hydrocarbon composed of two cyclopentadiene rings and two cyclopropene rings fused to one of cyclooctadiene; a dimer of calicene