cabochon

< /ˈkæb əˌʃɒnz; French ka bɔˈʃɔ̃/.

1. a precious stone of convex hemispherical or oval form, polished but not cut into facets.
2. an ornamental motif resembling this, either concave or convex and often surrounded by ornately carved leaf patterns, used on furniture of the 18th century.

adverb

3. in the form of a cabochon: a turquoise cut cabochon.

adjective

4. being cut cabochon: cabochon gems.

noun

1. a smooth domed gem, polished but unfaceted

n.

1570s, from French cabochon (14c.), augmentative of caboche (12c.), augmentative or pejorative formation, ultimately from Latin caput “head” (see capitulum). Essentially the same word as cabbage.