stroma

1. The framework, usually of connective tissue, of an organ, gland, or other structure, as distinguished from the parenchyma or specific substance of the part.
2. Aqueous phase of chloroplasts, chloroplast matrix.
3. Archaic term for mitochondrial matrix.
4. IN fungi, a mass of interwoven hyphae; it is here that fruiting bodies develop.

[G. strōma, bed]

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