שֵׂיבָה“greyheaded”The word שֵׂיבָה (sevah) means grey hair, and by extension the old age that grey hair marks. It is the common, feminine form of this word, used far more often than its masculine twin שֵׂיב (sev), and it carries the full range from the literal white hair of an aged head to advanced old age itself. It is the form that gets the full entry, and both forms rely on it.