The Collaborative International Dictionary
Tithymal
Tithymal \Tith"y*mal\, n. [L. tithymalus a plant with a milklike sap, Gr. ?: cf. F. tithymale.] (Bot.) Any kind of spurge, esp. Euphorbia Cyparissias.
Wiktionary
tithymal
n. Any kind of spurge, especially (taxlink Euphorbia cyparissias species noshow=1).