Which scale degree name refers to the seventh note of natural form minor scales?

The term that refers to the seventh note of natural form minor scales is indeed known as the "Subtonic." In the context of the natural minor scale, this seventh degree is a whole step below the tonic, making it distinct from other scale degrees.

In a natural minor scale, the sequence of notes is structured specifically, and the seventh note is typically found one step below the tonic note. For example, in the A natural minor scale, the notes are A, B, C, D, E, F, G, with G being the subtonic that precedes the tonic, which is A.

This reflects the characteristic sound of the natural minor scale, where the subtonic creates a specific harmonic context when transitioning back to the tonic. Understanding this scale degree is vital for recognizing how it functions within the structure of minor scales and in broader musical contexts.

The other scale degrees, while important in their own right, do not align with the position of the seventh note in natural minor scales. The tonic represents the first degree, the subdominant the fourth, and the dominant the fifth, and therefore do not correspond to the seventh note.