" However, I believe that the phrase "biologic food" may acceptable. As I understand it, the word "biologic" is a "more scientific" way of saying "biological," and so "biologic food" might be found in, say, a scientific paper about the differences between "natural (biologic) food," like carrots, and "synthetic food," like textured soy protein. " However, I believe that "economical" might possibly still be used in the context of economics if you're trying for some effect.
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DublinfanHowever, the biologic/al thing still doesn't seem to make sense to me, as does every otherI don't believe there is a logical pattern to these. Each form, whether in -ic or -ical, acquires its meaning in a rather random way over the course of history.
similar word that ends on -ic or ical...