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1. A biological father.
a. The male parent of an animal, especially a domesticated mammal.
b. The plant or gamete responsible for fertilizing an ovule that develops into a seed.
tr.v. sired, siring, sires
1. To be the biological father of (a child).
2. To be the male individual or gamete producing (an animal's offspring or a plant's seed) through sexual reproduction: the boar that sired the litter; pollen grains siring seeds.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.