Lexical Definition

‎ἐκβολή‎ ekbolḗ (ek-bol-ay') jettisoning ^G:N-F
from ‎ἐκβάλλω‎

+ lighten the ship.

• ejection, i.e. (specially) a throwing overboard of the cargo

Abbott-Smith

ἐκ-βολή, -ῆς (< ἐκβάλλω), [in LXX: Ex 11:1 (גָּרַשׁ), Jos 1:5 (ἐκβολὴν ποιεῖσθαι, טול hi.), Ez 47:8 (יָצָא)* ;]
1. a throwing out.
2. a jettison, a throwing overboard of cargo: Ac 27:18 (cf. Jos, l.c.; and v. Field, Notes, 144 f.).†

Abbott-Smith References

Liddell-Scott-Jones

ἐκβολή-ή, ἡ,

(ἐκβάλλω) throwing out, ψήφων ἐ. casting the votes out of the urn, [Refs 4th c.BC+]

__2jettisoning of cargo, [NT+4th c.BC+] (but simply, unloading, [Refs] casting out of it, getting rid of it, [Refs 5th c.BC+]
__II expulsion, banishment, [ἐκβολήαὶ ἐκ τῆς πόλεως 5th-6th c.BC: Plato Philosophus “Leges” 847b ">Refs 5th c.BC+]; dislodgement, ejection, [Refs 2nd c.BC+]
__II.2 divorce, repudiation, γυναικός [Refs 4th c.AD+]
__III letting fall or drop, δακρύων ἐκβολήαί [Refs 5th c.BC+]; ἐ. [ὀδόντων] casting or shedding of teeth, [Refs 4th c.BC+]
__IV expulsion of a foetus, [Refs 5th c.BC+]
__IV.2 ἐ. σίτου the time when the corn comes into ear, [Refs 5th c.BC+]
__IV.3 shoot, καυλοῦ [Refs 1st c.AD+]
__V putting out of a joint, dislocation, ἐκβολήαὶ τῶν ἄρθρων [Refs 1st c.AD+]
__VI putting forth, exposing, μαστῶν [Refs 2nd c.BC+]
__VII debouchure, outlet, ἐ. Πηνειοῦ [Refs 5th c.BC+]; mouth of a river, in plural, [Refs 5th c.BC+]: pass leading out of a chain of mountains, αἱ ἐκβολήαὶ τοῦ Κιθαιρῶνος [Refs 5th c.BC+]
__VII.2 by-way, ἐ. ἐκ τῆς ὁδοῦ τῆς εὐθείας [Refs 2nd c.AD+]digression, [Refs 5th c.BC+]
__VII.3 close of a verse, [Refs]
__VII.4 projection, στόματος a snout, [Refs 3rd c.AD+]
__VIII (from passive), that which is cast out, δικέλλης ἐ. earth thrown up by a mattock, upcast, [Refs 5th c.BC+]; οὐρεία ἐ. children cast or exposed on the mountains, [Refs 5th c.BC+]
__VIII.2 cargo thrown overboard, jetsam, πλὴν ἐκβολήῆς, ἣν ἂν..ἐκβάλωνται Syngr. cited in [Refs 4th c.BC+]; so ἐκβολήαὶ νεώς wrecked seamen, [Refs 5th c.BC+]
__IX in Music, interval of five διέσεις, [Refs 1st c.AD+]
__X ={ἐκβολήάς} I, [Refs 1st c.BC+]

_{LSJ Scripture Refs: Acts.27.18}