also: みずしも
frozen dew; frosty dew
Refers to dew that has frozen, typically in late autumn. A seasonal word (kigo) for haiku.
On a late autumn morning, frozen dew lay on the grass.
Her waters broke shortly before delivery.
Standard kanji spelling for both senses.
Alternate reading; less common.
Compound of 水 (water) and 霜 (frost). The reading みずじも is a rendaku form of しも. The amniotic fluid sense is an extended metaphorical use, likely from the visual similarity of the clear fluid to frozen dew.