Webster’s Revised Unabridged Dictionary · 1913
Structural
Struc′tur·al (strŭk′tūr·al; 135), a. 1. Of or pertaining to structure; affecting structure; as, a structural error.
2. (Biol.) Of or pertaining to organit structure; as, a structural element or cell; the structural peculiarities of an animal or a plant.
Structural formula. (Chem.) See Rational formula, under Formula.