/ ˈsaɪə(r); NAmE / noun , verb
■ noun
1.
( technical ) the male parent of an animal, especially a horse
—compare dam
2.
( old use ) a word that people used when they addressed a king
■ verb [ vn ]
1.
to be the male parent of an animal, especially a horse
2.
( old-fashioned or humorous ) to become the father of a child
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WORD ORIGIN
Middle English (in sense 2 of the noun): from Old French , from an alteration of Latin senior older, older man , comparative of senex , sen- old man, old. Sense 1 of the noun dates from the early 16th cent.