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When I was at Uwajimaya shopping yesterday, I picked up an interesting-looking root vegetable on a whim. It's quite large -- maybe a foot long or possibly even larger and too thick around to circle with one hand although small enough to easily circle with two hands. It has tan skin with evenly but irregularly-spaced darker spots, and out of each darker spot comes a few thin fibers like hairs. The flesh is smooth and just off-white (sort of cream-colored), with no appreciable odor. The label for the vegetable called it a [Something] Potato, and there might have been another, non-Anglicized name. Unfortunately, I did not write down what it was, and I have since forgotten.

It's definitely not a lotus root (no holes), and I'm pretty confident based on size, shape and appearance that it's not a regular potato either. It's also not jicima. It doesn't look like any sweet potato I've ever met, but that doesn't mean it isn't. My best bet right now is that it's tapioca root -- does anyone have any experience with tapioca root to confirm or deny?

Any ideas?

(Uwajimaya has more Japanese food than any other food, but it's pan-Asian, so this isn't necessarily a Japanese vegetable.)

EDIT: