Definition of glacial
1
: suggestive of ice: such as
a
: extremely cold : frigid
a glacial wind
b
: devoid of warmth and cordiality
a glacial handshake
c
: coldly imperturbable
maintained a glacial calm
2
: of a purity marked by the tendency to readily solidify in the form of ice-like crystals
glacial acetic acid
3a(1)
: of, relating to, or being any of those parts of geologic time from Precambrian onward when a much larger portion of the earth was covered by glaciers than at present
b
: of, relating to, or produced by glaciers
c
: suggestive of the very slow movement of glaciers
progress on the bill has been glacial
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Merriam-Webster unabridged
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Time Traveler for glacial
The first known use of glacial was in 1656
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