[dahy-per, dahy-uh-per]
a piece of cloth or other absorbent material folded and worn as underpants by a baby not yet toilet-trained.
Also called diaper cloth. a linen or cotton fabric with a woven pattern of small, constantly repeated figures, as diamonds.
Also called diaper pattern. such a pattern, originally used in the Middle Ages in weaving silk and gold.
verb (used with object)
to put a diaper on.
to ornament with a diaperlike pattern.

1300–50; Middle English diapre < Anglo-French dia(s)p(r)e < Medieval Latin diasprus made of diaper < Medieval Greek díaspros pure white, equivalent to Greek di- di3 + Medieval Greek áspros white

undiapered, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
diaper (ˈdaɪəpə)
1.  (US), (Canadian) Also called (in Britain and certain other countries): nappy a piece of soft material, esp towelling or a disposable material, wrapped around a baby in order to absorb its excrement
2.  a.  a woven pattern on fabric consisting of a small repeating design, esp diamonds
 b.  fabric having such a pattern
 c.  such a pattern, used as decoration
3.  (tr) to decorate with such a pattern
[C14: from Old French diaspre, from Medieval Latin diasprus made of diaper, from Medieval Greek diaspros pure white, from dia- + aspros white, shining]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 14c., from O.Fr. diapre "ornamental cloth," from M.L. diasprum, from Medieval Gk. diaspros, from dia- "entirely, very" + aspros "white." Aspros originally meant "rough," and was applied to the raised parts of coins (among other things), and thus was used in Byzantine Gk. to mean "silver coin,"
from which the bright, shiny qualities made it an adj. for "whiteness." Modern sense of "underpants for babies" is continuous since 1837, but such usage has been traced back to 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in architecture, surface decoration, carved or painted, generally composed of square or lozenge shapes but also of other simple figures, each of which contains a flower, a spray of leaves, or some such device. The pattern is repetitive and is usually based on a square grid. It was a common form of sculptural wall enrichment in Gothic art. An example is the 14th-century pulpitum, or choir screen, of Lincoln cathedral, Lincolnshire, England.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Until now all fossils of babies this ancient could have fit in a diaper.
Whether you are tracking sleep, feedings or diaper changes, your tablet is the
  perfect input device.
The naturally fearless, for example, live in the fast lane from their diaper
He changes his diaper, gives him a kiss and lays him in his crib.
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