1825–35; illustrate + -ed2

unillustrated, adjective
well-illustrated, adjective Unabridged


[il-uh-streyt, ih-luhs-treyt]
verb (used with object), illustrated, illustrating.
to furnish (a book, magazine, etc.) with drawings, pictures, or other artwork intended for explanation, elucidation, or adornment.
to make clear or intelligible, as by examples or analogies; exemplify.
Archaic. to enlighten.
verb (used without object), illustrated, illustrating.
to clarify one's words, writings, etc., with examples: To prevent misunderstandings, let me illustrate.

1520–30; < Latin illustrātus past participle of illustrāre to illuminate, make clear, give glory to. See il-1, luster1, -ate1

illustratable, adjective
overillustrate, verb (used with object), overillustrated, overillustrating.
preillustrate, verb (used with object), preillustrated, preillustrating.
reillustrate, verb (used with object), reillustrated, reillustrating.
superillustrate, verb (used with object), superillustrated, superillustrating. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
illustrate (ˈɪləˌstreɪt)
1.  to clarify or explain by use of examples, analogy, etc
2.  (tr) to be an example or demonstration of
3.  (tr) to explain or decorate (a book, text, etc) with pictures
4.  (tr) an archaic word for enlighten
[C16: from Latin illustrāre to make light, explain, from lustrāre to purify, brighten; see lustrum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Nearly every plant listed in this illustrated guide comes with suggestions for landscape use.
It has been amply illustrated and everything has been done to make it vivid and clear.
Each of her posts is beautifully written and illustrated with fine photography,
  so it's easy to get lost in them.
The contents illustrated a strict obedience to this principle.
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