BIOLOGICAL

[adjective]Biological means connected with the natural processes of living things.the biological sciencesThe biological cycle/rhythm of a plant is affected by light and heat.Eating is a biological necessity!Your biological clock is your body's natural habit of sleeping, eating, growing, etc. at particular times.Doctors believe that sufferers from this disease have no control over their biological clocks, which appear not to respond to light or dark.(informal) When a woman talks about her biological clock or says her biological clock is ticking (away) she means that she is worried that she is getting too old to be able to reproduce.Biological control is the use of one plant or animal to control another, esp. to prevent disease or damage.A biological mother/father/parent is the parent who caused a person to be born, although they might not be their legal parent or the parent who raised them.Biological warfare and biological weapons involve the use of living matter such as bacteria to seriously harm and kill people and animals and damage crops.Biological washing liquid/powder uses enzymes (= natural chemicals) to remove dirt.See also non-bio at non.