| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| helio- or (before a vowel) heli- | |
| —combining form | |
| indicating the sun: heliocentric; heliolithic | |
| [from Greek, from hēlios sun] | |
| heli- or (before a vowel) heli- | |
| —combining form | |
| [from Greek, from hēlios sun] | |