You searched for: “onychophagy”
onychophagy (s), onychophagies (pl) (noun forms)
The habit of biting one's finger nails: "As a result of tensions and uncertainties, the onychophagies of the children were easily seen by the pediatrician; who also considered himself to be an onychophagiatrician or an onychophagiatrist."
"The woman used artificial nails to hide the damage to her natural finger nails caused by her onychophagy."
This entry is located in the following unit: onych-, onycho-, ony-, -onychia, -onychial, -onychium, -onyx- + (page 4)