1728, "stem-like part of a flower pistil," alteration of Latin stilus "stake, stylus;" spelling influenced by Greek stylos "pillar" (see stet). Meaning "instrument for writing" is from 1807.
stylus sty·lus (stī'ləs)
n. pl. sty·lus·es or sty·li (-lī)
A pencil-shaped structure.
A pencil-shaped medicinal preparation for external application; as a medicated bougie.
See stylet.