Arachidic is an adjective that describes something that relates to arachidic acid or peanut oil. A few synonyms that can be used in place of arachidic include: 1. Peanutty - This is a colloquial term that is often used to describe something that has a distinct flavor or aroma of peanuts. 2. Arachidonic - This is a term that is commonly used in biochemistry to describe a type of unsaturated fatty acid found in animal tissues. 3. Groundnut - This is another word for peanuts and can be used in a sentence to describe something that has a nutty or peanut flavor. 4. Leguminous - This word refers to plants that belong to the Leguminosae family, such as peanuts, lentils, and beans.