Tēn'ū-is, n.

n.; pl. TĒN'Ū-ĒS. [Lat. tenuis, smooth.] (Gr. Gram.) One of the three letters κ, π, τ; — so called in relation to their respective middle letters, or medials, γ, β, δ, and their aspirates, φ, χ, θ. These terms are applied also to the corresponding articulate elements in any language.