the womb: a woman's belly as the place where a child is conceived and carried, nearly always inside the everyday phrase for being pregnant
The Greek word names the belly, the soft front of the body below the ribs. In the New Testament that plain physical sense is only ever put to one use: describing a woman who is carrying a child. Greek said this with a blunt, ordinary phrase, literally "to have in the belly," which was simply how the language said "to be pregnant." English Bibles smooth it into "with child" or "pregnant," and the belly drops out of sight.
Because the phrase was so ordinary, it brings no special reverence of its own. It turns up in an angel's announcement and in a warning about war in exactly the same plain form. The weight of each passage comes from the situation, not from the word: the shock of Mary being found pregnant before the wedding, the pity in the cry of woe over pregnant women caught in a siege, the sudden and unstoppable onset of labor pains as a picture of the day of the Lord.
One verse tilts the word slightly. When Gabriel tells Mary what will happen, the Greek pairs this word with the verb for conceiving rather than the verb for having, so it names the womb itself as the place where the child begins. Versions that read "you will conceive in your womb" are following that wording closely.
The word also stands behind one of the most quoted lines in the New Testament. Matthew 1:23 cites Isaiah 7:14 in its old Greek translation, where this same phrase renders the Hebrew word for a woman who is already pregnant (הָרָה).