dry hole
(archaic) psoriasis
(engineering) A hole drilled into the ground for oil or gas exploration which fails to yield enough oil or gas to justify the establishment of a well.
(chemistry) A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA (by means of three hydrogen bonds).
(anatomy, obsolete) A strong ligament of the back of the neck in quadrupeds, connecting the back of the skull with dorsal spines of the cervical vertebrae; the nuchal ligament.
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