Definitions

1. adjective

A type of spurge, a plant genus that includes the poison ivy and poison oak.

“The tithymal plant, known for its toxic sap, caused severe irritation on the hiker’s skin.”

2. noun

A spurge, a plant of the genus Euphorbia, especially one of the genus Euphorbia sect. Tithymalidium.

“The tithymal in the garden proved to be quite toxic, so gardeners were advised to handle it carefully.”