theelin en · NOUN
Etymology
The Greek word θῆλυς + suffix (“in”).
Meanings
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(qualifier:steroids, uncountable) The steroid hormone estrone.
The isolation of the crystalline hormone seems to justify the selection of a new name which should be reserved for the crystalline material and which in reality becomes the name of a new and probably hitherto unknown chemical substance. Accordingly, we suggest the term “theelin.“ This word is derived from the Greek word “theelus” used both adjectively and nominally to signify “female.”
1930 June, CD Veler, “The preparation of the crystalline follicular ovarian hormone: Theelin”, in Journal of Biological Chemistry, page 357: