What does "birdseed" mean?

Additional senses

1. 2.Marked with spots resembling bird's eyes; as, bird's-eye diaper; bird's-eye maple. BIRD'S-EYE Bird's"-eye`, n. (Bot.) A plant with a small bright flower, as the Adonis or pheasant's eye, the mealy primrose (Primula farinosa), and species of Veronica, Geranium, etc. BIRD'S-EYE MAPLE Bird's"-eye` ma"ple. See under Maple. BIRD'S-FOOT Bird's"-foot`, n. (Bot.) A papilionaceous plant, the Ornithopus, having a curved, cylindrical pod tipped with a short, clawlike point. Bird's-foot trefoil. (Bot.) (a) A genus of plants (Lotus) with clawlike pods. L. corniculatas, with yellow flowers, is very common in Great Britain. (b) the related plant, Trigonella ornithopodioides, is also European. BIRD'S-MOUTH Bird's-mouth`, n. (Arch.) An interior acrow's-foot in the United States. BIRD'S NEST; BIRD'S-NEST Bird's" nest`, or Bird's-nest, n.
2. 3.The nest in which a bird lays eggs and hatches her young.
3. 4.(Cookery) The nest of a small swallow (Collocalia nidifica and several allied species), of China and the neighboring countries, which is mixed with soups. Note: The nests are found in caverns and fissures of cliffs on rocky coasts, and are composed in part of algæ. They are of the size of a goose egg, and in substance resemble isinglass. See Illust. under Edible.
4. 5.(Bot.) An orchideous plant with matted roots, of the genus Neottia (N. nidus-avis.) Bird's-nest pudding, a pudding containing apples whose cores have been replaces by sugar. -- Yellow bird's nest, a plant, the Monotropa hypopitys. BIRD'S-NESTING Bird's-nest`ing, n. Hunting for, or taking, birds' nests or their contents. BIRD'S-TONGUE Bird's"-tongue`, n. (Bot.) The knotgrass (Polygonum aviculare).