sapinus
From LSJ
ἃ γὰρ δεῖ μαθόντας ποιεῖν, ταῦτα ποιοῦντες μανθάνομεν → what we have to learn to do we learn by doing
Latin > English (Lewis & Short)
sapīnus: (sapp-), i, f.
I Lit., a kind of fir- or pine-tree, Cato ap. Plin. 16, 39, 75, § 193; Varr. R. R. 1, 6, 4; Plin. 16, 12, 23, § 61; cf. id. 15, 10, 9, § 36 (al. sappium).—
II Transf., the lower, smooth part of the fir-tree, Vitr. 1, 2, 8; 1, 2, 9; Plin. 16, 39, 76, § 196.