| ANTHELION | • anthelion n. A faint, white halo rarely seen in the sky opposite the sun on the parhelic circle. • ANTHELION n. (Greek) a ring seen opposite the sun. |
| APHELIONS | • aphelions n. Plural of aphelion. • APHELION n. (Greek) the farthest point of a planet's orbit from the sun. |
| HELIODORS | • heliodors n. Plural of heliodor. • HELIODOR n. (Greek) a variety of clear yellow beryl occurring in SW Africa. |
| HELIOGRAM | • heliogram n. A message transmitted by a heliograph. • HELIOGRAM n. a message sent by reflecting the sun's rays with a mirror. |
| HELIOLOGY | • heliology n. (Dated) heliophysics. • HELIOLOGY n. the science of the sun. |
| HELIOPSES | • HELIOPSIS n. a genus of herbaceous flowering plants in the daisy family. |
| HELIOPSIS | • Heliopsis prop.n. A taxonomic genus within the family Asteraceae – certain flowering plants. • HELIOPSIS n. a genus of herbaceous flowering plants in the daisy family. |
| HELIOSTAT | • heliostat n. A device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined… • HELIOSTAT n. an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages. |
| HELIOTYPE | • heliotype n. A picture obtained by the process of heliotypy. • heliotype v. To produce pictures by heliotypy. • HELIOTYPE n. a picture obtained by the process of heliotypy. |
| HELIOTYPY | • heliotypy n. A method of transferring pictures from photographic negatives to hardened gelatin plates from which… • HELIOTYPY n. a photomechanical process in which the gelatine relief is itself used to print from. |
| HELIOZOAN | • heliozoan n. Any of a group of aquatic protozoans, of the order Heliozoa, that have spherical bodies from which radiate… • HELIOZOAN adj. related to the Heliozoa, sun-animalcules, an order of Protozoa, also HELIOZOIC. • HELIOZOAN n. a member of the Heliozoa. |
| HELIOZOIC | • HELIOZOIC adj. relating to the Heliozoa, sun-animalcules, an order of Protozoa, also HELIOZOAN. |
| PARHELION | • parhelion n. A bright spot in the sky due to the refraction of the sun’s image by ice crystals. • parhelion n. A reflection or image. • PARHELION n. a halolike light seen in sky opposite the sun. |