Definition of "symptomatic"

It is important to observe symptomatic cats out of the carrier, on the floor in a safe, escape-proof room. Swelling, heat, and pain in one or more joints can explain many signs, including lameness, malaise, and fever.

2009, Stephen J. Ettinger, Edward C. Feldman, Textbook of Veterinary Internal Medicine, page 9

Symptomatic of a shallow understanding and an unamiable temper.

1843, Thomas Macaulay, Sir James Mackintosh's History of the Revolution

And it is symptomatic of the many paradoxes of Lederer's life that of all the people in the room, Brotherhood is the one whom he would most wish to serve, if ever he had the opportunity, even though — or perhaps because — his occasional efforts to ingratiate himself with his adopted hero have met with iron rebuff.

1986, John le Carré, A Perfect Spy