tenuity

The air seemed what we call “hollow” and had apparently hardly enough tenuity to convey sounds.
The Collected Works of Ambrose Bierce|Ambrose Bierce
By this contrivance the roving is drawn out into a thread of the desired degree of tenuity and hardness.
The New Gresham Encyclopedia. Vol. 1 Part 2|Various
He was frightened by the expression of her face, whose pallor and extreme tenuity had something fatal about it.
The Trapper's Daughter|Gustave Aimard
In only one case, I believe I saw bifurcating cement-ducts, of extreme tenuity, viz.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2)|Charles Darwin

The tenuity of the film increases; its cohesion is overcome; lakelets are formed, and they merge into each other.
Scientific American Supplement, No. 561, October 2, 1886|Various

Origin of tenuity