lenitive
Concise Oxford English Dictionary © 2008 Oxford University Press:
lenitive /ˈlɛnɪtɪv/ Medicine, archaic
▶adjective (of a medicine) laxative. ▶noun a laxative.
– origin ME: from med. L. lenitivus, from lenit-, lenire ‘soften’.
'lenitive' also found in these Oxford entries:

