DeMundo 145:8 :ܐܢ ܗ݂ܘ ܕܝܢ ܕܢܬܦܬܐ ܗܢܐ݂܂ ܠܬܪ̈ܝܗܘܢ ܓܒ̈ܐ ܩܘܡܛܣ ܡܬܩܪܐ‏ : if this widens to both sides, it is called a comet
See the entire entry for pty vb. to be wide

DeMundo 145:8 :ܐܢ ܗ݂ܘ ܕܝܢ ܕܢܬܦܬܐ ܗܢܐ݂܂ ܠܬܪ̈ܝܗܘܢ ܓܒ̈ܐ ܩܘܡܛܣ ܡܬܩܪܐ‏ : should this (shooting star) be spread out to the two sides, it is called a comet
See the entire entry for qwmṭ n.m.pl. comet