Lexical Definition

‎ἐνδόμησις‎ endómēsis (en-dom'-ay-sis) material ^G:N-F
from a compound of ‎ἐν‎ and a derivative of the base of ‎δῆμος‎

building.

• a housing in (residence), i.e. structure

Abbott-Smith

*† ἐν-δώμησις (Rec. -δόμησις), -εως, ἡ (< δωμάω, to build),
a build­ing in: ἡ ἐ. τ. τείχους αὐτῆς ἴασπις, its wall had jasper built into it, Re 21:18 (v. MM, Exp., xiii; Swete, Ap., l.c.).†

Abbott-Smith References

Liddell-Scott-Jones

ἐνδόμησις-ησις, εως, ἡ,

thing built in, structure, τοῦ τείχους [NT]; especially mole or breakwater, [Refs 1st c.AD+]; compare ἐνδώμησις.

_{LSJ Scripture Refs: Rev.21.18}