tachistesthesia (medicine) and barchan (iou)

tachistesthesia (medicine)

tachistesthesia

An obsolete term for recognition of light flicker.

Origin: G. Tachistos, very rapid, from tachys, rapid, + aesthesis, perception

barchan (iou)

barchan noun. Also barchane. L19.
[Turkic barkhan.]
A shifting crescent-shaped sand-dune, concave on the leeward side.

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