WordNet
n. a card expressing get-well wishes
Wikipedia
A get-well card is a greeting card which is sent to someone when they are ill. Their use in the case of chronic and terminal illness is problematic because the patient may not be expected to recover but they may still offer comfort to the invalid.
Usage examples of "get-well card".
Hagrid sent him a bunch of earwiggy flowers that looked like yellow cabbages, and Ginny Weasley, blushing furiously, turned up with a get-well card she had made herself, which sang shrilly unless Harry kept it shut under his bowl of fruit.
I picked up some prettied gift ribbons in a fire-engine red and a get-well card with a sentimental verse.
He handed Hoke a Hallmark get-well card that had been signed by forty of the forty-seven members of the Homicide Division, including Captain Brownley.
As Jonesy approaches the gray thing with the sheet pulled up to its narrow hairless chest, he sees there is a single get-well card on the bedtable.