Cylindrical (bore)
internal diameter, not changing from top to bottom
Cylindrique (Perce ~); Zylindrisch (i.e. Zylindrische Bohrung); Cilíndrica (Sección ~).
Identical types: 4➺ Conical; NB: Ammer defines the term as, "the inside of the pipe does not taper"..
Cylindrical pipes have only the odd overtones and thus lack the octave, can’t be overblown, and have a more nasal sound than conical pipes.
Ammer, Christine: The facts on file dictionary of music. New York, 2004 [4th ed.], p.22 (bagpipe), &c. [10 results].