Spindrift usually refers to spray, particularly to the spray blown from cresting waves during a gale. This spray, which "drifts" in the direction of the gale, is one of the characteristics of a wind speed of 8 Beaufort and higher at sea.
In Great Britain "spindrift" is the telltale sign used by mariners to define a Force 8 (Beaufort Scale) wind (not higher) when observed at sea. See this example of information provided by Lymington Harbour authority, Hampshire, England, UK, explaining the whole scale, the associated wind speeds, and its telltale signs. Text from the site states:
Force 8, defined as "Gale". Wind speed 39-46 mph, equal to 34-40 knots. Inland, twigs break off trees; progress generally impeded. At sea, moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks along the direction of the wind.
Relatedly, spindrift can also be used to describe fine sand or snow that is blown off by the wind.
Spindrift is a southern English word, Spoondrift a northern or Scottish word. The Scottish word spoondrift can be used to describe fine snow that is blown off the hills by the wind.
Some sources regard "spoondrift" as a direct alternative to "spindrift" in all its uses.
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