Etymology
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Kleenex (n.)

1924, proprietary name, registered by Cellucotton Products Company, Neenah, Wisconsin, U.S.; later Kimberly-Clark Corp. An arbitrary alteration of clean + brand-name suffix -ex.

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Definitions of Kleenex

Kleenex (n.)
a piece of soft absorbent paper (usually two or more thin layers) used as a disposable handkerchief;
From wordnet.princeton.edu