borrowed from Medieval Latin (as translation of Greek psīlós "bare, plain," applied to the consonants π, τ, κ), going back to Latin, "thin, narrow, slight" — more at thin entry 1
1650, in the meaning defined above
“Tenuis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tenuis. Accessed 29 Sep. 2023.
Britannica.com: Encyclopedia article about tenuis
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