The primitive or first body cavity in an embryo or simple animal, representing the earliest stage of body organization before more complex cavity systems develop.
From Greek 'archi-' (first, primitive) and 'koilos' (hollow). This embryological term describes the original body space in developing organisms.
Every animal starts from this simple principle—a hollow space where organs and systems eventually develop; studying archicoel helps scientists understand the fundamental blueprint of animal development.
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