Final answer:
The term 'fluted' particularly refers to the rounded channels or grooves on a column or pilaster, also known as stria, which is correctly identified as option a) Fluting in the given question.
Step-by-step explanation:
The term fluted refers to a rounded channel or groove, which is a decorative element often found on columns and pilasters. This architectural detail consists of vertical indented lines or grooves creating a sharp visual effect. These fluted grooves can also be found on cylindrical piers, as mentioned in historical descriptions, where they add texture and depth to the structure, sometimes accentuated by painting or other forms of ornamentation. In the context of the options provided, fluting corresponds to the concept of a rounded channel or groove and is also known as a stria.
Therefore, the correct answer to the question 'Rounded channel or groove, aka: stria' is option a) Fluting.