Webster's 1913 Dictionary
TENUIS
Ten "u *is, n.; pl. Tenues. Etym: [NL. , fr. L. tenuis fine, thin. See Tenuous. ] (Gr. Gram. )
Defn: One of the three surd mutes k, p, t; -- so called in relation to their respective middle letters, or medials, g, b, d, and their aspirates, x, f, th. The term is also applied to the corresponding letters and articulate elements in other languages.
Duden Dictionary
tenuis
te nu is Adjektiv Medizin tenue |t e nuis |lateinisch tenuis dünn, zart
Tenuis
Te nu is Substantiv, feminin , die |T e nuis |die Tenuis; Genitiv: der Tenuis, Tenues |[…e:s ]|stimmloser Verschlusslaut (z. B. p ); Gegensatz Media 1
The Wordsmith Dictionary