Definition

1. Noun:
   • A genus of plants: In some botanical classifications, a genus comprising certain species formerly placed in the genus Rhus that have foliage causing contact dermatitis.
   • Characteristic toxicity: The defining feature of this genus is that its members produce urushiol, an oil that is poisonous to the human skin upon contact.

Usage Examples

• Noun:
  • Poison ivy is a well-known member of the genus Toxicodendron.
  • Botanists reclassified several plants into the genus Toxicodendron due to their toxic properties.

Advanced Usage

• In taxonomic context: Used in scientific and botanical writing to specify a group of plants distinguished by their production of urushiol.
  • The study focused on the evolutionary history of the genus Toxicodendron.

Variants and Related Words

• Toxicodendron radicans (n): The scientific name for poison ivy.
• Toxicodendron diversilobum (n): The scientific name for Pacific poison oak.
• Toxicodendron vernix (n): The scientific name for poison sumac.

Synonyms

• Poison ivy/oak/sumac group: A descriptive, non-scientific synonym referring to the common plants within this genus.

Notes on Meaning

This term is strictly a scientific botanical classification. In everyday language, people refer to the individual species by their common names (e.g., poison ivy). The term "genus Toxicodendron" is primarily used in academic, horticultural, or medical contexts discussing the plants' biology, identification, or toxicology.

Noun

1. in some classifications: comprising those members of the genus Rhus having foliage that is poisonous to the touch; of North America and northern South America