noun
flax
FLAKS/flæks/
A plant cultivated for linen-producing stems and oil-rich seeds.
Farmers grow flax for its strong fibers and oil-rich seeds.

Etymology
Old English fleax named both the plant and linen made from it. That shared name connects the living crop with its use as a source of textile fiber.
In context
… from the growers of the flax and the wool to the bleachers and smoothers of the linen …
More examples
- Linen is woven from flax fibers.
- She stirs ground flax into her oatmeal.
- The field of flax blooms with small blue flowers.
Forms
flax
flaxseed noun — The oil-rich seed of the flax plant.
flaxen adjective — Pale yellow, like processed flax fiber.