extendible(s = adj.all) extendable - capable of being lengthened;
Derived form verb extend₁₀, verb extend₁₃, verb extend₁₅, verb extend₅, verb extend₆

1.  Capable of being extended, susceptible of being stretched, extended, enlarged, widened, or expanded. [1913 Webster]

2.  Liable to be taken by a writ of extent. [1913 Webster]