Where does “-ήθρα” come from?

-ήθρα (Ancient Greek) comes from Ancient Greek -θρον, from Proto-Hellenic [[*-tron]] ~ [[*-tʰron]], from Proto-Indo-European [[*-trom]] ~ [[*-dʰrom]].

Ancestry of “-ήθρα”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	-θρον	—
2	Proto-Hellenic	[[-tron]] ~ [[-tʰron]]	—
3	Proto-Indo-European	[[-trom]] ~ [[-dʰrom]]	—

Words derived from “-ήθρα”

urethra
urethral
transurethral
periurethral
bulbourethral
neourethra
intraurethral
vesicourethral
rectourethral
paraurethral
suburethral
pubourethral
megalourethra
transurethrally
urethralgia
posttransurethral
nonurethral
urethra
uretral
uretra
уретра
бульбоуретральный
urètre
urétral

Every word from Proto-Indo-European [[*-trom]] ~ [[*-dʰrom]] →

-ήθρα — Etymology, Origin & Word History | Etymology Explorer