Structural \Struc"tur*al\, 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.

Source: Webster's Revised Unabridged Dictionary (1913)