Biology. pertaining to organic structure; morphological.
3.
Geology. of or pertaining to geological structure, as of rock or strata.
4.
Chemistry. pertaining to or showing the arrangement or mode of attachment of the atoms that constitute a molecule of a substance. Compare structural formula.
5.
resulting from or pertaining to political or economic structure.
of, pertaining to, or based on the assumption that the elements of a field of study are naturally arranged in a systematic structure: structural grammar.