What is the X in X-mas?
Old English sed, sæd "that which may be sown; an individual grain of seed; offspring, posterity," from Proto-Germanic *sediz "seed" (cf. Old Norse sað, Old Saxon sad, Old Frisian sed, Middle Dutch saet, Old High German sat, German Saat), from PIE *se-ti- "sowing," from root *se- (1) "to sow" (see sow (v.)). Figurative use in Old English. Meaning "offspring, progeny" rare now except in biblical use. Meaning "semen" is from c.1300. For sporting sense, see seed (v.).
late 14c., "to flower, flourish; produce seed;" mid-15c., "to sow with seed," from seed (n.). Meaning "remove the seeds from" is from 1904. Sporting (originally tennis) sense (1898) is from notion of spreading certain players' names so as to insure they will not meet early in a tournament. The noun in this sense is attested from 1924. Related: Seeded; seeding.
A ripened plant ovule that contains an embryo.
A propagative part of a plant, such as a tuber or a spore.
Noun A mature fertilized ovule of angiosperms and gymnosperms that contains an embryo and the food it will need to grow into a new plant. Seeds provide a great reproductive advantage in being able to survive for extended periods until conditions are favorable for germination and growth. The seeds of gymnosperms (such as the conifers) develop on scales of cones or similar structures, while the seeds of angiosperms are enclosed in an ovary that develops into a fruit, such as a pome or nut. The structure of seeds varies somewhat. All seeds are enclosed in a protective seed coat. In certain angiosperms the embryo is enclosed in or attached to an endosperm, a tissue that it uses as a food source either before or during germination. All angiosperm embryos also have at least one cotyledon. The first seed-bearing plants emerged at least 365 million years ago in the late Devonian Period. Many angiosperms have evolved specific fruits for dispersal of seeds by the wind, water, or animals. See more at germination, ovule.