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halloo to call out loudly to attract the attention of (someone). [3 definitions]
hallow to consecrate or make holy. [3 definitions]
hallowed considered sacred; venerated. [2 definitions]
Halloween October 31, the eve of All Saints' Day, which is now celebrated primarily by costumed children who go from house to house begging for treats or playing tricks.
hall tree a clothes tree, esp. one standing in an entrance hall.
hallucinate to have hallucinations. [2 definitions]
hallucination a false or distorted but compelling sensory perception, as induced by drugs or by mental derangement such as schizophrenia. [2 definitions]
hallucinatory of, similar to, or caused by hallucinations.
hallucinogen a natural or synthetic substance that induces false or distorted sensory perceptions.
hallway a narrow passage in a house or building; corridor. [2 definitions]
halo a circle of light depicted in paintings as shining around the head of a divine or sacred being. [2 definitions]
halo- halogen. [2 definitions]
halocarbon a chemical compound of carbon and a halogen.
halo effect the tendency of extraneous material or ideas to affect a judgment, attitude, or the like, esp. in a favorable direction. [2 definitions]
halogen any of the five nonmetallic elements fluorine, chlorine, iodine, bromine, and astatine.
halogenate to treat or combine with a halogen. [2 definitions]
haloid like or derived from a halogen.
Halong Bay a body of water in the Gulf of Tonkin along the coast of northern Vietnam that is densely clustered with vegetation-covered, monolithic islands, many of which have caves.
haloperidol an antipsychotic drug used to treat alcohol withdrawal and psychological disorders such as schizophrenia.
halt1 to stop or pause, as in a movement or operation. [4 definitions]
halt2 to falter or stumble in movement, thought, writing, and the like. [3 definitions]