imbed has the recorded history: A variant of embed, from in-/em- ('in') + bed. Bed is from Old English bedd ('bed, plot'), from Proto-Germanic *badją. Morphologically, the prefixed shape matters: the initial element belongs to the recorded formation and helps explain the modern form's surface analysis. In present English, the verb sense is "to fix firmly within a surrounding mass; variant of embed", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as embed and bed, and in derivatives such as imbedded and imbedding. Its semantic neighborhood includes embed, implant, insert, and fix, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English bedd and Proto-Germanic *badją.