cat·e·nar·y /ˈkætnˌɛri; especially Brit. kəˈtinəri/ noun, pluralnar·ies, adjective
1. Mathematics. the curve assumed approximately by a heavy uniform cord or chain hanging freely from two points not in the same vertical line. Equation: y = k cosh(x/k).
2. (in electric railroads) the cable, running above the track, from which the trolley wire is suspended.
3. of, pertaining to, or resembling a catenary.
4. of or pertaining to a chain or linked series.

[Origin: 1780-90; < L caténārius relating to a chain, equiv. to catén(a) a chain + –ārius -ary]


A sweat catenary had formed along his hairline.

Source: Turn of the Cards, Victor Milán.