tertial

adjective
ter·​tial | \ ˈtərshəl\

Definition of tertial

 (Entry 1 of 2)

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

noun
\ "\
plural -s

Definition of tertial (Entry 2 of 2)

: a tertial feather

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History and Etymology for tertial

Adjective

Latin tertius third + English -al; from the fact that tertials form the third row of feathers

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