The meaning of “σπέρμα”

“He answered and said unto them, He that soweth the good seed is the Son of man;”

“Saying, Master, Moses wrote unto us, If any man’s brother die, having a wife, and he die without children, that his brother should take his wife, and raise up seed unto his brother.”

“And God spake on this wise, That his seed should sojourn in a strange land; and that they should bring them into bondage, and entreat them evil four hundred years.”

“But God giveth it a body as it hath pleased him, and to every seed his own body.”

“Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.”