Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sinistral is an adjective meaning "of or on the left". It carries 2 recorded senses.
of or on the left
“a sinistral gastropod shell with the apex upward has its opening on the left when facing the observer”
“a sinistral flatfish lies with the left eye uppermost”
preferring to use left foot or hand or eye
“sinistral individuals exhibit dominance of the left hand and eye”
Definitions, synonyms and semantic relations for sinistral come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.