Word:

hairy ball

(topology)hairy ball - A result in topology stating that a continuous vector field on a sphere is always zero somewhere. The name comes from the fact that you can't flatten all the hair on a hairy ball, like a tennis ball, there will always be a tuft somewhere (where the tangential projection of the hair is zero). An immediate corollary to this theorem is that for any continuous map f of the sphere into itself there is a point x such that f(x)=x or f(x) is the antipode of x. Another corollary is that at any moment somewhere on the Earth there is no wind.
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hairline
hairline fracture
hairnet
hairpiece
Hairpin
hairpin bend
hairsbreadth
Hairsplitter
Hairsplitting
Hairspring
Hairstreak
hairstreak butterfly
hairstylist
Hairtail
hairweaving
Hairy
-- hairy ball --
hairy darling pea
hairy finger grass
hairy golden aster
Hairy Hands
hairy honeysuckle
hairy lip fern
hairy root
hairy spurge
hairy tare
hairy tongue
hairy vetch
hairy willowherb
hairy wood mint
hairy-legged vampire bat
Haiti
Haitian
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