From an article on kiting:
Leading edge inflatable kites, known also as inflatables, LEI kites or C-kites, are typically made from ripstop polyester with an inflatable plastic bladder that spans the front edge of the kite with separate smaller bladders that are perpendicular to the main bladder to form the chord or foil of the kite.
Earlier today I asked a question on what is it exactly that forms the chord or foil (according to the sentence): the bladder configuration as a whole or the smaller bladders only.
Now I want to confirm or refute my gut feeling that "chord" and "foil" are used synonymously here. I beleive they are, since the coordinating conjunction or is placed between them, meaning the sentence could be rephrased as:
The configuration of bladders forms the characteristic of the kite called "chord" or "foil".
In what other way could the use of OR be interpreted? That the bladder configuration sometimes forms the cord and in other instances forms the foil of the kite? That's illogical.
Moreover, citing from the Wikipedia article on Airfoil:
The chord line is the straight line connecting leading and trailing edges. The chord length, or simply chord, c, is the length of the chord line. That is the reference dimension of the airfoil section.
It feels like chord could be used synonymously with (air)foil.