ESSENTIAL a.
al character (Biol.), the prominent characteristics which serve to distinguish one genus, species, etc., from another. -- Essential disease, Essential fever (Med.), one that is not dependent on another. -- Essential oils (Chem.), a class of volatile oils, extracted from plants, fruits, or flowers, having each its cha…
EUPHORBIA n.
Spurge, or bastard spurge, a genus of plants of many species, mostly shrubby, herbaceous succulents, affording an acrid, milky juice. Some of them are armed with thorns. Most of them yield powerful emetic and cathartic products.