Webster's Revised Unabridged Dictionary · 1913

Eager

Eager , adjective

[Old English egre sharp, sour, eager, Old French agre, aigre, French aigre, from Latin acer sharp, sour, spirited, zealous; akin to Greek {not transcribed} highest, extreme, Sanskrit a{not transcribed}ra point; from a root signifying to be sharp. Compare Acrid, Edge.]

1.
Sharp; sour; acid. [Obsolete]
Like eager droppings into milk. — Shakespeare
2.
Sharp; keen; bitter; severe. [Obsolete]
A nipping and an eager air. — Shakespeare
Eager words.
3.
Excited by desire in the pursuit of any object; ardent to pursue, perform, or obtain; keenly desirous; hotly longing; earnest; zealous; impetuous; vehement; as, the hounds were eager in the chase.
And gazed for tidings in my eager eyes. — Shakespeare
How eagerly ye follow my disgraces! — Shakespeare
When to her eager lips is brought Her infant's thrilling kiss. — Keble
A crowd of eager and curious schoolboys. — Hawthorne
Conceit and grief an eager combat fight. — Shakespeare
4.
Brittle; inflexible; not ductile. [Obsolete]
Gold will be sometimes so eager, as artists call it, that it will as little endure the hammer as glass itself. — Locke

Eager , noun

Same as Eagre.