Word Study
vital sign
WORDNET DICTIONARY
Noun vital sign has 1 sense
- vital sign(n = noun.state) Array - sign of life; usually an indicator of a person's general physical condition; "he was still alive but his vital signs were weak" has particulars: blood heat, body temperature, blood pressure, heart rate, pulse, pulse rate, rate of respiration, respiratory rate
is a kind of sign
For further exploring for "vital sign" in Webster Dictionary Online

