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Definition of monosiphonous in English:
monosiphonous
adjective
Botany1Of an algal stem or filament: composed of a single strand of large elongated cells. Of an alga: having filaments of this kind.
2Of a pollen grain: producing a single pollen tube during germination. Of a pollen tube: single.
Origin
Mid 19th century; earliest use found in William Henry Harvey (1811–1866), botanist. From mono- + siphon + -ous.
