One who uses a sickle; a sickleman; a reaper.(noun)
A person who has sickle-cell disease.(noun)
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Use "sickler" in a sentence
"We have our first sickler the second week I am there."
"The four-year-old girl in this room is an asthmatic; the teenage boy in that bed is a sickler in VOC vaso-occlusive crisis."
"Way back when I taught medical students and residents, I would not allow them to call a child a "diabetic" or a "sickler" or an "asthmatic", something I learned from a cranky attending when I was a student."