1) an abortion, abortive birth
2) an untimely birth
Part of Speech: noun neuter
Citing in TDNT: 2:465, 220
From a compound of G1537 and τιτρώσκω titrôskô (to wound); a miscarriage (abortion), that is, (by analogy) untimely birth: - born out of due time.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἔκτρωμα; click on the second column to search for that grammatical form of the root ἔκτρωμα; click on the third column to search for that word and grammatical form; click on the total to search for the root ἔκτρωμα.