|äktə|dekə|dīə|nōik- noun
Etymology: octadecadienoic International Scientific Vocabulary octadecadiene C 18 H 34 (International Scientific Vocabulary octadeca- — from octa- + deca- — + -diene ) + -oic
: any of several unsaturated fatty acids C 17 H 31 COOH some of which (as linoleic acid) occur in fats and oils