What does "coral tree" mean?

Any of the trees of the genus Erythrina, of most tropical and subtropical regions.

What is a synonym for "coral tree"?

Common synonyms include: erythrina.

noun

noun ·Rare ·Advanced level

Noun

1
Any of the trees of the genus Erythrina, of most tropical and subtropical regions.
2
any of various shrubs or shrubby trees of the genus Erythrina having trifoliate leaves and racemes of scarlet to coral red flowers and black seeds; cultivated as an ornamental wordnet

The spiky red flowers resemble coral.