Tēr'tial1, a.
a. [From Lat. tertius, third, because they are feathers of the third row.] (Ornith.) Growing on the last or innermost joint of a bird's wing; — said of quills. Sorenson.
2 entries under this word
Tertial
Tēr'tial2, n.
n. (Ornith.) One of the quills or large feathers which grow near the junction of the wing with the body.