Definitions

1. verb

to form or become arched beneath, typically in an inverted manner

“The subarcuate leaves of the plant allowed it to thrive in dry conditions.”

2. verb (archaic)

to form or become arched above

“The subarcuate vaults of the cathedral were a marvel of medieval engineering.”

3. noun

a structure that is arched beneath, typically in an inverted manner

“The subarcuate bridge spanned the deep chasm.”