Definify.com
Webster 1913 Edition
Weathercock
Weath′er-cockˊ
,Noun.
1.
A vane, or weather vane; – so called because originally often in the figure of a cock, turning on the top of a spire with the wind, and showing its direction.
“As a wedercok that turneth his face with every wind.” Chaucer.
Noisy
weathercocks
rattled and sang of mutation. Longfellow.
2.
Hence, any thing or person that turns easily and frequently; one who veers with every change of current opinion; a fickle, inconstant person.
Weath′er-cockˊ
,Verb.
T.
To supply with a weathercock; to serve as a weathercock for.
Whose blazing wyvern
weathercock
the spire. Tennyson.