halley hallex • Halleyan · · · Info · Definitions · Characters · · halley · · Text Latin · · Script 6 · · Length 3 · · Syllables Definitions · · · (noun) English astronomer who used Newton's laws of motion to predict the period of a comet (1656-1742). Synonyms: Halley, Edmond Halley, Edmund Halley. · · Noun Definition 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C y latin small letter y U+0079