DeMundo 144:30 :ܚܘܓܬܐ ܕܝܢ ܐܝܬܘܗܝ݂݁܂ ܙܗܪܐ ܕܢܨܝܚܘܬܗ ܕܚܕ ܡܢ ܢܗܝܪ̈ܐ ܕܚܕܪ̈ܝ ܓܝܓܠܗ݀܂ ܕܡܫܚܠܦܐ ܡܢܗ ܒܝܚܝܕܝܘܬܗ‏ : a halo is the brilliant shine of one of the luminaries surrounding its disk that differs from (a rainbow) by its close connection (to the luminary it surrounds)
See the entire entry for yḥydw n.f. oneness, singular existence