| helices |
a plural form of helix. |
| helicoid |
coiled or curving in the form of a spiral. [2 definitions] |
| helicopter |
a type of aircraft held aloft and propelled by horizontally rotating blades attached to its top side. |
| helio- |
sun. |
| heliocentric |
having the sun's center as an imagined vantage point or as a starting point for measurements. [2 definitions] |
| heliograph |
a mirrored instrument that transmits signals by intermittently reflecting the sun's rays. [2 definitions] |
| Helios |
in Greek mythology, the god personifying the sun; Sol. |
| heliotaxis |
the movement of a freely moving organism toward or away from sunlight. |
| heliotrope |
any of various plants whose apexes turn toward the sun, esp. a garden plant that bears fragrant purple blossoms. [2 definitions] |
| heliotropism |
the tendency to turn toward or away from light, esp. sunlight, as in a sunflower. |
| heliport |
a facility, often on a rooftop, where a helicopter may take off or land. |
| helium |
a chemical element of the inert gas group that contains two protons in each nucleus and that occurs as a lighter-than-air gas often used for lifting power and in air-free atmospheres where an inert gas is required, as in welding. (symbol: He) |
| helix |
a three-dimensional curve with a central axis and a steadily increasing, steadily decreasing, or constant circumference; spiral. |
| hell |
in some religions, the place where the souls of wicked people are punished after death. [6 definitions] |
| he'll |
contracted form of "he will." |
| hellbender |
a large salamander found in rivers and streams of the eastern United States. |
| hell-bent |
unshakably and incautiously determined (usu. fol. by "on"). [2 definitions] |
| hellcat |
(informal) a hot-tempered or wicked woman. |
| helldiver |
a grebe, esp. the pied-billed grebe. |
| hellebore |
any of several mostly poisonous herbs that bear white or greenish flowers. [2 definitions] |
| Hellene |
a native or citizen of ancient Greece. |