Definition of drillable:
(adj) :
Suitable for being drilled through.
(adj) :
(agriculture) Suitable for being applied using a seed drill.
(adj) :
(computing, education, media studies) Supporting a drilldown action in which one can discover more details about a topic or text.
(adj) :
(education) Appropriate for learning through repeated practice (drill).
(adj) :
(robotics) Having an arm or manipulator that can position the tool or attachment at the end in different orientations.