halocarpus
- n dioecious trees or shrubs of New Zealand; similar in habit to Dacrydium
haloform
- n compounds with the formula CHX3, where X is a halogen atom
halogen
- n any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
halogeton
- n a coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content
halogeton glomeratus
- n a coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content
halogeton souda
- n Algerian plant formerly burned to obtain calcium carbonate
halon
- n a compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms; very stable; used in fire extinguishers although it is thought to release bromine that depletes the ozone layer
haloperidol
- n tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome
halophil
- n archaebacteria requiring a salt-rich environment for growth and survival
halophile
- n archaebacteria requiring a salt-rich environment for growth and survival
haloragaceae
- n a family of dicotyledonous plants of the order Myrtales
haloragidaceae
- n a family of dicotyledonous plants of the order Myrtales