(countable) A dried stalk of a cereal plant.

(uncountable) Such dried stalks considered collectively; this bulk matter may be a chief salable product, a by-product, fodder, bedding, or green manure, depending on region and on current market conditions.

(countable) A drinking straw.

(uncommon) A pale, yellowish beige colour, like that of a dried straw.

(figurative) Anything proverbially worthless; the least possible thing.

To lay straw around plants to protect them from frost.

Made of straw.

Of a pale, yellowish beige colour, like that of a dried straw.

(figurative) Imaginary, but presented as real.