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Glossary

Glossary

Every technical term used here, defined.

Terms
1,702
With an illustration
23
Cross-references
66
Used in profiles
1,807

4 terms beginning with Y

  1. yolk

    Substance in an animal egg consisting of protein and fat that nourishes the developing embryo.

    Used in 112 profiles

  2. yolk sac

    A membranous sac containing yolk attached to the ventral surface of embryos and early larvae in some fishes. Retained for a period post-hatching in those species which form yolk sac larvae.

    Used in 221 profiles

  3. yolk sac larva

    Post-hatching larval stage occurring in many fish species whereby the yolk sac remains attached to the ventral surface for a period. The larva does not feed normally until the yolk is fully-absorbed.

  4. yolk sac viviparity

    Form of livebearing in which the larvae are mostly nourished by a yolk sac which is fully-absorbed prior to birth.