Relating to or composed of secondary yolk material, or describing the nutritive reserves in an egg that form after the primary yolk.
From Greek deuteros (second) + vitellus (Latin for yolk) + -ose (full of). A biological term combining the 'second' prefix with 'yolk' to describe secondary nutritive material.
Egg yolks aren't simple blobs—they have complex layers and types of nutritive material formed at different times, and this word lets biologists talk about the secondary reserves that develop later.
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