Century Dictionary and Cyclopedia
- Pertaining to, or of the nature of, percentage; expressed as a percentage; in percentage.
- n. In com., same as percentage: as, at a ruinous percental.
“This would equal a percental frequency increase of 13, 19 and 11 per cent across from the GTX”
“The similarity to human germline genes of the VH and VL genes (germinality index) of the anti-Crf2 scFvs was calculated according to Pelat et al.  indicated by percental identity of the VH or VL framework region to the most similar human germline gene identified by VBASE2 (”
These user-created lists contain the word ‘percental’.
A roster of adjectives that infrequently surface in typical conversation and writing. Many are dredged from scientific or other technical jargon or sieved from examples of disused archaic forms.
Looking for tweets for percental.