Zoology A wing or winglike structure or part.
Anatomy A flat, winglike anatomic process or part, especially of bone.
Botany The flattened border of some stems, fruits, and seeds, or either one of the two side petals of certain flowers in the pea family.
ALA (ā'ěl-ā') n. Delta-aminolevulinic acid; an intermediate in the biosynthesis of hematin formed from glycine and succinyl-coenzyme A.