pregnanediol
/ˌprɛɡneɪnˈdʌɪɒl/(also pregnandiol) Biochemistry and Medicine
noun
A steroid alcohol which is a product of the metabolism of progesterone and is used as a measure of progesterone production, especially during pregnancy; 5β-pregnane-3,20-diol, C21H36O2.
Origin
1930s; earliest use found in Chemical Abstracts. From German Pregnandiol from classical Latin praegnans + German di- + -ol.