Lexical Definition

‎κόκκος‎ kókkos (kok'-kos) seed G:N-M
apparently a primary word

corn, grain.

Usage: 4 forms in 8 verses
Form Translated As     In Verse(s)
κόκκῳ a grain Mark.4.31
to a grain Matt.13.31Luke.13.19
κόκκων scarlet LXX.Lam.4.5
κόκκοσ grain John.12.24
κόκκον a grain Luke.17.6
a seed Matt.17.20
grain 1Cor.15.37

Abbott-Smith

κόκκος, -ου, ὁ, [in LXX: La 4:5 B א R (תּוֹלָע), Si 45:11*;]
a grain: Mt 13:31 17:20, Mk 4:31, Lk 13:19 17:6, Jo 12:24, I Co 15:37.†

Abbott-Smith References

Book Refs
Lamentations 4:5
Matthew 13:31 · 17:20
Mark 4:31
Luke 13:19 · 17:6
John 12:24
1 Corinthians 15:37

Liddell-Scott-Jones

κόκκος, ,

grain, seed, as of the pomegranate, [Refs 5th c.BC+]; κ. Βαβυλώνιος [Refs 2nd c.AD+]; of the poppy, [Refs 3rd c.BC+]; of the pine, [Refs]; of wheat, [Refs 3rd c.AD+]; of weeds in corn, [Refs 6th c.AD+]; compare Κνίδιος: metaphorically, νόου δέ μοι οὐκ ἔνι κ. not a grain of sense, [Refs]

__2 a measure, [Refs 1st c.AD+]
__II 'berry' (gall) of kermes oak, used to dye scarlet, [Refs 4th c.BC+]: hence, scarlet (the colour), [Refs 4th c.BC+]
__II.2 κ. or κ. βαφική, , kermes oak, Quercus coccifera, [Refs 1st c.AD+]
__III pill, [Refs 6th c.AD+]
__IV in plural, testicles, [Refs 2nd c.AD+]
__IV.2 pudenda muliebria, [Refs 5th c.AD+]