Freebase(0.00 / 0 votes)Rate this definition: Portable Network Graphics. Portable Network Graphics is a raster graphics file format that supports lossless data compression. PNG was created as an improved, non-patented replacement for Graphics Interchange Format, and is the most used lossless image compression format on the World Wide Web.
Definition of menopause. 1 : the natural cessation of menstruation that usually occurs between the ages of 45 and 55; also : the period during which such cessation occurs âcalled also climacteric â compare perimenopause. 2 : cessation of menstruation from other than natural causes.
The word menopause comes from the Greek and Latin words for moon and stop, and refers to the ending of a woman's menstrual cycle, viewed by some throughout history to be influenced by the moon. The moon may or may not affect our periods, but estrogen most certainly does. As we age, our bodies begin to produce less estrogen, resulting in irregular or nonexistent menstruation. This can also occur after removal of the uterus and both ovaries and is then called a surgical menopause. Non-surgical menopause usually occurs around the age of 50, give or take five years. It is not impossible, however, for it to happen as early as age 35 or as late as age 60.