κέρας

Etymology
From, probably remodeled from an earlier s-stem (like , , ), as preserved in e.g. , from ; see there for more. An older etymology supposes.

Noun

 * 1) horn (of an animal)
 * 2) horn as a material, or anything made of horn, such as a bow.
 * 3)  horn (musical instrument)
 * 4) arm or branch of a river
 * 5) the side branch (either left or right) of a military array for battle.

Inflection
was sometimes declined using the stem and sometimes the stem. Both are shown below.

Etymology
From.

Noun

 * 1)  horn
 * 2)  horn wind instrument