Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
preternatural is an adjective meaning "surpassing the ordinary or normal". It carries 2 recorded senses.
surpassing the ordinary or normal
“Beyond his preternatural affability there is some acid and some steel”
“his uncanny sense of direction”
existing outside of or not in accordance with nature
“find transcendental motives for sublunary action”
Definitions, synonyms and semantic relations for preternatural come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.