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invigorate
invigorating
invincible
inviolable
inviolate
inviscid
invisible
invisible hand
invisible ink
invisible trade
invitation
invitational
invitatory
invite
inviting
invocation
invoice
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invisible ink
in·vis·i·ble ink


noun 
Definition:
 
ink invisible until treated: a liquid used to write something that cannot be seen until the paper is treated in some way, e.g. with heat
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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