"Leather-leaved" refers to a type of plant with thick, tough leaves that resemble leather. Some synonyms for this term include "leathery," "coriaceous," and "tough-skinned." "Leathery" is the most commonly used word to describe plants that have tough, durable leaves that can withstand harsh conditions. "Coriaceous" is a more technical term that refers specifically to plant materials that are thick and leathery. "Tough-skinned" is a more descriptive synonym that emphasizes the durability and resilience of the plant's leaves. These synonyms can be used interchangeably to describe plants with thick, durable leaves that are resistant to damage and decay.