One of the mysteries of the English language finally explained.
1Of a substance: not in a liquid state; not having the consistency of a liquid. Compare "liquid". Also figurative rare after 17th cent.
2Of an asset, investment, etc.: not held in cash; not readily convertible into cash; illiquid.
Mid 16th century; earliest use found in Andrew Borde (c1490–1549), physician and author. From un- + liquid.
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