Part of speech: adjective
Definition: Of or pertaining to an apnoea
Part of speech: noun
Definition: A perceived change in some function, sensation or appearance of a person that indicates a disease or disorder, such as fever, headache or rash.Anything that indicates, or is characteristic of, the presence of something else, especially of something undesirable.
Example sentence: The awareness of the ambiguity of one's highest achievements (as well as one's deepest failures) is a definite symptom of maturity.