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because my OCD wont let it go, is the British Horrible said with a silent H? Hense the "an horrible" instead of "a horrible?"
Placing "an" before a word beginning in a sounded "h" is a vintage grammatical practise. Aside from a few holdovers ("an historical..", for instance), the practise had pretty much died out by 1925 or so. In the time period of AETHERIC, it would still be in use. Hence its appearance here.