tertial
1 of 2adjective
ter·tial
ˈtərshəl
1
: of, relating to, or constituting the flight feathers borne on the basal joint of a bird's wing compare primary sense 2c
2
: of, relating to, or constituting some of the innermost secondaries when different from the others or the scapular feathers —not used technically
tertial
2 of 2noun
"
plural -s
: a tertial feather
Word History
Etymology
Adjective
Latin tertius third + English -al; from the fact that tertials form the third row of feathers