slanu gismu

x₁ is a cylinder [shape/form] of material x₂.

In notes:

gunro: x₁ rolls/trundles on/against surface x₂ rotating on axis/axle x₃; x₁ is a roller.
kamju: x₁ is a column/pillar of material x₂.
slanymapku: m₁=s₁ is a top hat [cylindrical hat] made of material m₂=s₂.
slanyvau: x₁ is a barrel/cylindrical container of material x₂=s₂ containing x₃=v₂
tarmrsilondre: x₁ is a generalized cylinder (see notes for details) of form/shape x₂.