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
heliopause
- n the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet
heliophila
- n any of various South African herbs and subshrubs cultivated for long showy racemes of bright blue flowers with white eyes
heliopsis
- n any North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowers
helios
- n (Greek mythology) ancient god of the sun; drove his chariot across the sky each day; identified with Roman Sol