Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
ελαταί fir trees LXX.Song.5.11
ελάτησ fir tree LXX.Gen.21.15
ελάται fir trees LXX.Ezek.31.8

Liddell-Scott-Jones

ἐλάτη (elatē) fir tree G:N-F

ἐλάτη [], ,

silver fir, Abies cephalonica, ὑψηλή [Refs 8th c.BC+]; περιμήκετος κετος[Refs 8th c.BC+]; also, Abies pectinata, [Refs]

__II oar, as made of pine-wood, λεύκαινον ὕδωρ ξεστῇς ἐλάτῃσιν [Refs 8th c.BC+]; later, ship or boat, [Refs 5th c.BC+]
__III the spathe of the date inflorescence, [Refs 5th c.BC+]
__IV sea-weed supposed to resemble the fir, Cystoseira Abies-marina, [Refs 4th c.BC+]