1. causing death in approximately half of a test population or sample
Usage: scientific; genetics

Examples

• The semilethal mutation resulted in a 50% survival rate among the offspring.
• Researchers studied the semilethal effects of the new drug compound.
• The semilethal dose was carefully calculated for the experiment.
• Semilethal genes often provide valuable insights into essential biological processes.
• The laboratory reported semilethal outcomes in their toxicity studies.