helicteres isora
- n East Indian shrub often cultivated for its hairy leaves and orange-red flowers
helicopter
- n an aircraft without wings that obtains its lift from the rotation of overhead blades
helicteres
- n genus of shrubs and small trees of tropical America and Asia having cylindrical fruits spirally twisted around one another
heliobacter
- n a genus of helical or curved or straight aerobic bacteria with rounded ends and multiple flagella; found in the gastric mucosa of primates (including humans)
heliobacter pylori
- n the type species of genus Heliobacter; produces urease and is associated with several gastroduodenal diseases (including gastritis and gastric ulcers and duodenal ulcers and other peptic ulcers)
heliocentric parallax
- n the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline
heliograph
- n an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
- v signal by means of a mirror and the using the sun's rays
heliometer
- n an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope