This stumped me whilst attempting to post a reply in a different thread. Olfactorilly springs to mind but it isn’t listed at www.dictionary.com and somehow doesn’t sound right. Does anybody know what word would replace xxx?
smelly 
I’ve seen it around, but with only one ‘L’ in the ending. So, olfactorily.
Oops, I got that backwards. Never mind.
Olfactorily doesn’t appear at www.dictionary.com or www.askoxford.com either. Can anybody confirm this with a copy of OED2?
Yep, we’ve got the 20-volume OED 2nd edition in the office. “Olfactorily” is in there: “adv: in the sense of smell” with cites back to 1888, mostly from scientific writing.
Thanks, I wonder why it is omitted from those online dictionaries.
I’ve definitely heard “olfactorily” on occasion, though it is a little awkward. But it’s out there.
Probably because if they had every word there is they couldn’t be free. If you’d tried Merriam-Websters they’d have told you that it was a word, but they weren’t going to tell you more than that unless you pay up.
I would have expected “olfactorally,” but my dictionary doesn’t have either.
“nasally” might be another option.
I think the word they want is aural. It’s an adjective, so is visually.
From Merrian- Webster Online;
And the definitions are similar;
SP2263, the olfactory sense is the sense of smell.
Not to mention that visually is not an adjective. It’s an adverb.
redolent
OOOPS!!! DUH I don’t know what I was thinking.