1. of, relating to, or belonging to the iris family (Iridaceae) of plants
Usage: botanical term; formal

Examples

• The iridaceous plants in the garden included irises, crocuses, and gladiolus.
• Botanists classify many ornamental flowers as iridaceous species.
• The iridaceous family is known for its distinctive sword-shaped leaves.
• Freesias are popular iridaceous flowers prized for their fragrance.
• The herbarium contained several pressed iridaceous specimens from the 19th century.