Good for Dreams
I dreamed that my wife and I were in an unfamiliar town and saw that they had a farmer's market going on. She loves those, and so we went over to browse. One of the stalls had a tray piled with soap-like bricks of aromatics. My wife grabbed a turquoise-colored one, smelled it, and said, "Mmm, ephun! Yes, please!" and bought it on the spot. I had never heard of the plant before, so I looked at a nearby sign, which simply said, "Turquoise: ephun, good for dreams." I picked one up and smelled it, but just like in the waking world, my sense of smell didn't work and I could smell nothing.
I woke up and wrote the dream down, just like I always do, and did a web search for "ephun," but found nothing. While meditating today, I had the brainwave to try searching for it in Greek ("ἴφυον"), and it turns out it's simply spike lavender, which is, indeed, good for dreams.
It's a pretty specialized word and I've not encountered it in my studies, so it seems my dream has taught me something. (This wouldn't be the first time, though it is the first time I can say with certainty that it wasn't something that I could plausibly have known but forgotten.)