資料來源 : pyDict

閂鎖鑰匙,彈簧鎖鑰匙

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Latchkey \Latch"key`\, n.
   A key used to raise, or throw back, the latch of a door, esp.
   a night latch.

資料來源 : WordNet®

latchkey
     n : key for raising or drawing back a latch or opening an
         outside door