ld -abbr

  1. load
  2. lord

LD -abbr

  1. laser disc
  2. learning disabled; learning disability
  3. lethal dose
  4. line of departure

LDC -abbr

  1. least developed country; less developed country

LD50 [,el-,dē-'fif-tē] -n

  1. the amount of a toxic agent (as a poison, virus, or radiation) that is sufficient to kill 50 percent of a population of animals usu. within a certain time

ldg -abbr

  1. landing
  2. loading

LDH -abbr

  1. lactate dehydrogenase; lactic dehydrogenase

LDL [,el-(,)dē-'el] -n

  1. a lipoprotein of blood plasma that is composed of a moderate proportion of protein with little triglyceride and a high proportion of cholesterol and that is associated with increased probability of developing atherosclerosis called also bad cholesterol

Ldo·pa ['el-'dō-pə] -n

  1. the levorotatory form of dopa that is obtained esp. from broad beans or prepared synthetically, is converted to dopamine in the brain, and is used in treating Parkinson's disease called also levodopa

LDPE -abbr

  1. low-density polyethylene

ldr -abbr

  1. leader

LDS -abbr

  1. Latter-day Saints