資料來源 : pyDict

圖片描述符  ;   公共域,( PUBLIC DOMAIN 的縮寫,指公益軟體而言,這類軟體的使用是完全免費的)

資料來源 : WordNet®

Pd
     n : a silver-white metallic element of the platinum group that
         resembles platinum; occurs in some copper and nickel
         ores; does not tarnish at ordinary temperatures and is
         used (alloyed with gold) in jewelry [syn: {palladium}, {atomic
         number 46}]

資料來源 : Free On-Line Dictionary of Computing

PD
     
        {public domain}