Answer: DNA

DNA, also known as deoxyribonucleic acid, is a molecule that contains the genetic instructions for the development, functioning, growth, and reproduction of all known organisms, including humans. In the context of a crime lab evidence, DNA refers to the genetic material that can be collected and analyzed to identify individuals and establish relationships between people or trace evidence to a specific source.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Makeup ingredient?. Explanations are generated by AI and may be inaccurate.