Lexical Definition

‎κτῆνος‎ ktēnos (ktay'-nos) animal ^G:N-N
from ‎κτάομαι‎

beast.

• property, i.e. (specially) a domestic animal

Abbott-Smith

κτῆνος, -ους, τό (< κτάομαι, hence primarily a possession), [in LXX chiefly for בְּהֵמָה, Ge 1:25, al., also for מִקְנֶה, צֹנֵא, etc.;]
a beast, (in late Gk. esp.) a beast of burden: Lk 10:34 pl. (as chiefly in cl.), Ac 23:24, Re 18:13; of quadrupeds, as opp. to fishes and birds (cf. Ge 1:25), I Co 15:39.†

Abbott-Smith References

Liddell-Scott-Jones

κτῆνος, εος, τό,

(κτάομαι) mostly in plural κτήνεα, contraction κτήνη, flocks and herds, [Refs 5th c.BC+]; κ. τὰ δημιοπληθῆ [Refs 4th c.BC+]; of beasts in general, [Refs 1st c.AD+]; opposed to ἄνθρωποι, [Refs 3rd c.AD+]; of swine, [Refs 2nd c.BC+]

__2 in singular, a single beast, as an ox or sheep, [Refs 5th c.BC+]; horse or mule for riding, [NT]; of a domestic animal, opposed to θηρίον, [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Luke.10.34 ☩ Acts.23.24}