AIR VESSEL n.
vessels of insects, birds, plants, etc.; the air vessel of a pump, engine, etc. For the latter, see Air chamber. The air vessels of insects are called tracheæ, of plants spiral vessels.
ALBUMEN n.
Nourishing matter stored up within the integuments of the seed in many plants, but not incorporated in the embryo. It is the floury part in corn, wheat, and like grains, the oily part in poppy seeds, the fleshy part in the cocoanut, etc.