1. a female sex hormone, specifically estrone, used in medical treatments
Usage: medical; biochemical

Examples

• The doctor prescribed theelin to help regulate her hormone levels.
• Theelin was one of the first estrogen compounds to be isolated and studied.
• Research on theelin contributed to our understanding of female reproductive health.
• The pharmaceutical company developed a synthetic form of theelin.
• Theelin therapy was commonly used in the mid-20th century for menopausal symptoms.