PRINCIPLE n.
a substance, or gives it its essential properties, and which can usually be separated by analysis; -- applied especially to drugs, plant extracts, etc. Cathartine is the bitter, purgative principle of senna. Gregory. Bitter principle, Principle of contradiction, etc. See under Bitter, Contradiction, etc.…
PSEUDHAEMAL a.
cular system of annelids. Pseudhæmal fluid, the circulatory fluid, or blood, of annelids, analogous to the blood of vertebrates. It is often red, but is sometimes green or colorless. -- Pseudhæmal vessels, the blood vessels of annelids.