noun, feminine/tɛs.tɔs.te.ʁɔn/plural: testostérones
testostérone is feminine in French.
testosterone (steroid hormone that stimulates development of male secondary sexual characteristics, produced mainly in the testes, but also in the ovaries and adrenal cortex)
Compound of test(icule) + -o- + stér(ol) + (horm)one.