plural of jewel-neck

Often written in old manuscripts or transcriptions of them, denoting a capital F.

Any of the genus Thelazia of nematode worms that parasitize the eyes of their hosts.

(organic chemistry) Either of the two isomeric carboxylic acids, normal butyric acid and isobutyric acid, with the chemical formula C₃H₇COOH, occurring in animal milk fat.