Five features of emerging adults. As Arnett describes it, emerging adulthood can be defined as an: Age of identity exploration. Young people are deciding who they are and what they want out of work, school and love. Age of instability.
Definition of biohazard. : a biological agent or condition that is a hazard to humans or the environment; also : a hazard posed by such an agent or condition.
Noun [edit]. biohazard symbol (plural biohazard symbols). 1  A symbol that is universally recognized as a warning against substances that pose a threat to the health of living organisms, primarily that of humans.oun [edit]. biohazard symbol (plural biohazard symbols). 1  A symbol that is universally recognized as a warning against substances that pose a threat to the health of living organisms, primarily that of humans.