a. [f. TAP v.1 + -ABLE.] Capable of being tapped or pierced for juice; fit for tapping.
1906. Herbert Wright, Hevea Brasiliensis, 28. Young trees which have been bud-pruned in the manner suggested above show an increased rate of circumferential growth, and this means the attainment to a tappable size at an earlier period.
1910. Westm. Gaz., 13 April, 10/1. [The estate] already possesses no fewer than 40,780 [rubber] trees, with 14,700 at a tappable age.
1910. Morning Post, 22 April, 1/3. [The] C. Rubber Company … having over 100,000 tappable trees between four and 10 years old.
