tenuis

1. not comparablehuman sciencesOf Greek consonants, neither aspirated nor voiced, as [p], [t],
2. not comparablehuman sciencesOf obstruents in other languages, not voiced, aspirated, glottalized, or otherwise different in phonation from the prototypical values of the voiceless IPA letters ([p], [t], [k], [f], [θ], [s], [ʃ], etc.).

   The superscript equal sign ˭ is here used to denote the Czech tenuis consonant, in this case the plosive [t˭], which lacks aspiration, in order to contrast it with its aspirated counterpart in English [tʰ].

   2016, Malá & Šaffková, editor, ELT Revisited, page 11

plural tenues

1. human sciencesA tenuis consonant.

   The tenuis becomes aspirate in Low-German.

   1887, Max Müller, (Please provide the book title or journal name)

   1 more example

   Since the explosive was a tenuis before a consonant we have -p m- and -t n-; these combinations were mutated to mh and nh in the following examples, the voicelessness of the tenuis being retained after its assimilation

   1913, John Morris-Jones, A Welsh grammar, page 184