touch·wood 
(tŭchwd′)
(tŭchwd′)n.
Material, such as decayed wood, that is used as tinder; punk.
[From its being easy to ignite.]
- hypermetropia
- hypermetropic
- hypermetropical
- hypermetropy
- hypermile
- hypermnesia
- hypermnesic
- hypernatremia
- hypernym
- hypernymic
- hyperon
- hyperope
- hyperopia
- hyperopic
- hyperostosis
- hyperostotic
- hyperphagia
- hyperpigmentation
- hyperpituitarism
- hyperpituitary
- hyperplasia
- hyperplastic
- hyperploid
- hyperploidy
- hyperpnea