One of the mysteries of the English language finally explained.
1Of an algal stem or filament: composed of several strands of large elongated cells. Of an alga: having filaments of this kind.
2Of a pollen grain: producing two or more pollen tubes during germination.
Mid 19th century; earliest use found in Miles Berkeley (1803–1889), Church of England clergyman and naturalist. From poly- + siphon + -ous.
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