There is no decisive line of demarcation in the universe that segregates experience on the one side from insensitive objects on the other. (religion-online.org)
The discoloration gradually faded out at the upper and lower margins of the involved segment, so that there was no definite line of demarcation between healthy and sick tissue. (discovermagazine.com)
Hair loss with dandruff and pigmentation are common and often there is a «water line» pattern, a clear line of demarcation along the body below which the skin is irritated and above which the skin is normal. (vin.com)