cirrus

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cir·rus / ˈsirəs/ • n. (pl. cir·ri / ˈsirˌī; ˈsirē/ ) 1. cloud forming wispy filamentous tufted streaks (“mare's tails”) at high altitude, usually 16,500–45,000 feet (5–13 km).2. Zool. a slender tendril or hairlike filament, such as the appendage of a barnacle, the barbel of a fish, or the intromittent organ of an earthworm. ∎  Bot. a tendril.

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