STRIA

Stri″a (?), n.; pl. Striæ (#). [] 1. 1. A minute groove, or channel; a threadlike line, as of color; a narrow structural band or line; a striation; as, the striæ, or groovings, produced on a rock by a glacier passing over it; the striæ on the surface of a shell; a stria of nervous matter in the brain.
2. 2. (Arch.) A fillet between the flutes of columns, pilasters, or the like. Oxf. Gloss.