Usage: 2 forms in 16 verses
Form Translated As     In Verse(s)
εικάδοσ twentieth LXX.Exod.12.18
twentieth day LXX.Hag.2.18
εικάδι twentieth LXX.Gen.7.11 • LXX.Gen.8.4 • LXX.Gen.8.14 • LXX.Num.10.11 • LXX.Ezra.10.9 • LXX.Neh.6.15
twentieth day LXX.2Kgs.25.27 • LXX.Esth.8.9 • LXX.Jer.52.31 • LXX.Hag.1.15 • LXX.Hag.2.1 • LXX.Hag.2.10 • LXX.Hag.2.20 • LXX.Zech.1.7

Liddell-Scott-Jones

εἰκάς (eikas) the twentieth day G:N-F

εἰκάς, άδος, ἡ,

Aeolic dialect dative plural εἰκάδεσσι [Refs 5th c.BC+]: (εἴκοσι):—twentieth day of the month (i.e. ἡμέρα), [Refs 8th c.BC+]; ἡ πρώτη, δευτέρα, etc., μετ᾽ εἰκάδα, εἰκάδας, the 21st, 22nd, etc., [Refs 4th c.BC+], the last ten days of the month, [Refs 5th c.BC+]; τρίτῃ εἰκάδι, i.e. the 23rd, [Refs 5th c.BC+]

__II name of the sixth day of the Eleusinian mysteries (= Boedromion [Refs 5th c.BC+]
__III plural, divisions of a tribe, [Refs 5th c.AD+]