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insolate
insolation
insole
insolent
insolubilize
insoluble
insolvable
insolvent
insomnia
insomuch as
insomuch that
insouciance
insoul
insourcing
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insomnia
in·som·ni·a [ in sómnee ə ]


noun 
Definition:
 
difficulty in sleeping: inability to fall asleep or to remain asleep long enough to feel rested, especially when this is a problem that continues over time
[Early 17th century. < Latin< insomnis "sleepless" < somnus "sleep"]

in·som·ni·ac adjective, noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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