Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
subterminal is an adjective meaning "near but not precisely at an end". It carries one recorded sense.
near but not precisely at an end
“a subterminal band of color on the tail feathers”
Definitions, synonyms and semantic relations for subterminal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.