• Webster's Revised Unabridged Dictionary
    • n Homoplast (Biol) One of the plastids composing the idorgan of Haeckel; -- also called homo├Ârgan.
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Century Dictionary and Cyclopedia
    • n homoplast An organ or part corresponding in external form to another, though of distinct nature.
    • n homoplast That which is homoplastic, as any aggregate or fusion of plastids: opposed to alloplast.
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In literature:

Homoplastic: implies that organs, similar in situation and purpose, are not structurally the same, or have not the same origin.
"Explanation of Terms Used in Entomology" by John. B. Smith