2 in notes

fibra -fib-fibr- experimental gismu

x₁ is a fiber of type/material x₂

Also see cilta ("thread").

• lensisku

In notes:

bukmapra

x₁ is a quantity of lint (short fluffy fibrous material) of composition x₂

buknailo

x₁ is nylon (type of synthetic polymer) of type/composition x₂.