spissitas

From LSJ

χελῶναι μακάριαι τοῦ δέρματος → you tortoises are fortunate in your skin, you blessed turtles with your shell

Source

Latin > English (Lewis & Short)

spissĭtas: ātis, f. spissus,
I compactness, density (post-Aug. and very rare): quercus (opp. raritas), Vitr. 2, 9 med.: tritici, Plin. 18, 30, 73, § 304.

Latin > French (Gaffiot 2016)

spissĭtās, ātis, f. (spissus), densité : Vitr. Arch. 2, 9, 8 ; Plin. 18, 304.

Latin > German (Georges)

spissitās, ātis, f. (spissus), die Dichte, Dichtheit, Vitr. 2, 9, 8. Plin. 18, 304.