LD1
《精神医》learning-disabled；《医学》lethal dose 致死量；long distance；...
LD2
神を賛えよ（praise (be) to God）語源［ラテン laus Deo］
Ld.
《商業》limited；Lord
LDC
Less Developed Country
ldg.
landing；loading
LDL
《生化学》low-density lipoprotein
LDP
Liberal Democratic Party
LDPE
《化学》low-density polyethylene
LDS
Latter-day Saints；((英))Licentiate in Dental Surgery 歯科外科医
