Definitions for yearlingˈyɪər lɪŋ
Random House Webster's College Dictionary
an animal in its second year.
a horse one year old, dating from January 1 of the year after the year of foaling.
(adj.)being a year old.
Origin of yearling:
toddler, yearling, tot, bambino(noun)
a young child
a racehorse considered one year old until the second Jan. 1 following its birth
an animal in its second year
An animal that is between one and two years old.
A racehorse that is considered to be one year old until a subsequent January 1st.
an animal one year old, or in the second year of its age; -- applied chiefly to cattle, sheep, and horses
being a year old