Another happy trawl through the dictionary, occasioned by the news of a new orthopaedic wing for Kirkcaldy’s hospital. Orthos is straight, genuine or right angles, leading to orthodox, orthotics and new to me, orthoepy, the study of correct pronunciation. It is also much used in chemistry and by association, geology.
On the same page, ortanique, which sounds as if it should derive from old French, but is actually a portmanteau word: orange tangerine unique. People get away with just making this stuff up!
The concept of portmanteau words was of course brought into being by Lewis Carroll, where he used two words to make one, the most famous being slithy, from lithe and slimy. Porter is to carry and manteau is a cloak.