HippAp 10(6) :ܟܝ̈ܢܐ܃ ܡܢܗܘܢ ܡ݁ܢ ܠܘܬ ܩܝܛܐ܃ ܡܢܗܘܢ ܕܝܢ ܠܘܬ ܣܬܘܐ܃ ܫܦܝܪܐܝܬ ܐܘ݁ ܒܝܫܐܝܬ ܡܟܝܢܝܢ‏ : some (human) natures are better or worse suited to summer, some to winter
See the entire entry for mḵayyan adj. established, proper