Usage: 3 forms in 4 verses
Form Translated As     In Verse(s)
σχοίνόν my rush LXX.Ps.139.3
σχοίνων rushes LXX.Joel.3.18LXX.Mic.6.5
σχοίνοσ rush LXX.Jer.8.8

Liddell-Scott-Jones

σχοῖνος (schoinos) a rush G:N-M

σχοῖνος, ,

also , [Refs 5th c.BC+]:— rush, [Refs 5th c.BC+]; πλεκτὴ σ. [Refs 5th c.BC+][same place]; στιβὰς σχοίνων [Refs]; especially camel-hay, Cymbopogon Schoenanthus, [Refs 5th c.BC+]

__b σ. ὀξύς, σ. ἑλεία, σ. λεία, ={ὀξύσχοινος}, [Refs 4th c.BC+]; σ. κάρπιμος, ={μελαγκρανίς}, [Refs 4th c.BC+]; σ. Εὐριπική, ={ὁλόσχοινος}, [Refs 4th c.BC+]
__2 reed, used as an arrow or javelin, [Refs]; as a 'thorn in the side', [Refs 5th c.BC+]; as a spit, [Refs 5th c.BC+]; as a pen, [LXX]; as a means of exploring a narrow and crooked passage in the skull, καθιέντας σ. ὑείαν τρίχα [Refs 2nd c.AD+]
__3 rush-bed, [Refs 8th c.BC+]
__II anything twisted or plaited of rushes, especially rope, cord, Oracle texts cited in [Refs 5th c.BC+]
__II.2 fence round a garden, [Refs]
__II.3 strap of a bed, [Refs 6th c.AD+]
__III a land-measure, used especially in Egypt, δύναται σ., μέτρον ἐὼν Αἰγύπτιον, ἑξήκοντα στάδια [Refs 5th c.BC+]; but varying in length accusative to [Refs 3rd c.BC+] “*Geometry texts” 23.20,43; τῷ μεγάλῳ (corrected to δικαίῳ) σ. [Refs 3rd c.BC+]; also τέχνῃ κρίνετε, μὴ σχοίνῳ Περσίδι τὴν σοφίην [Refs]

LSJ Scripture Refs: LXX.Jer.8.8