Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
loop-line is a noun meaning "a railway branch line that branches from the trunk line and then rejoins it later on". It carries one recorded sense.
a railway branch line that branches from the trunk line and then rejoins it later on
Definitions, synonyms and semantic relations for loop-line come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.