wind shake 
(wĭnd)
(wĭnd)n.
A crack or separation between growth rings in timber, attributed to the straining of tree trunks in high winds.
- instability
- instal
- install
- installation
- installation art
- installer
- installment
- installment
- installment plan
- instalment
- instalment
- instance
- instancy
- instant
- instantaneity
- instantaneous
- instantaneously
- instantaneousness
- instanter
- instantiate
- instantiation
- instantiative
- instantly
- instant message
- instant messaging