LDL is a low-density lipoprotein, one of the five major groups of lipoproteins.

Look up LDL in Wiktionary, the free dictionary.

LDL or LdL may also refer to:

• Learning by teaching (German: Lernen durch Lehren, LdL), whereby students learn by themselves teaching
• Loudness discomfort level in hyperacusis
• LDL decomposition, Cholesky decomposition in linear algebra

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