Abbreviations for nouns / noun phrases used as non-nouns
Spec
As a noun, it appeared as a short form of specification.
It is now also used as a verb. Meaning is to write specifications for.
When you use it is as a verb (e.g. spec your Ferrari), you can't replace the short form spec with the originating noun's long form specification.
Blog. Section. Airmail.
It's one of the many ways English enriches itself. I don't know what "technically incorrect" might mean in this context, but I can find no meaning in it.
Dial comes from the latin phrase rota dialis meaning "daily wheel", and has evolved to mean any round plate over which something rotates. The verb is from 1650s, "to work with aid of a dial or compass;" telephone sense is from 1923.
Etymology Online