noun
ADJECTIVE
▪ broad , great , high , huge , long , sweeping , wide
▪
They fired shells in a high ~ over our heads.
▪ perfect , smooth
▪ graceful
VERB + ARC
▪ describe ( technical ), form , make
▪
The jet trail formed a perfect ~ in the sky.
▪ follow , trace
PREPOSITION
▪ in an ~
▪
The islands lie in a wide ~ just off the mainland.
Arc is used before these nouns: ↑ furnace