cleidoic egg

cleidoic egg
an egg (such as that of a reptile, bird, or primitive mammal) that has within itself enough nutritive material for production of a complete embryo, needing to absorb nothing from its environment except oxygen. Except for oxygen intake, it can develop, at the expense of the substances stored inside the egg itself, directly into miniature adults without passing through a larval stage.

Medical dictionary. 2011.

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Look at other dictionaries:

  • cleidoic — clei·do·ic klī dō ik adj of an egg enclosed in a relatively impervious shell which reduces free exchange with the environment <the eggs of birds are cleidoic> * * * clei·do·ic (kli doґik) [Gr. kleidouchos holding the keys] isolated from the …   Medical dictionary

  • cleidoic — (ˈ)klī|dōik adjective Etymology: Greek kleidoun to fasten, lock in (from kleid , kleis key, bolt) + English ic of an egg : cut off or isolated from free exchange with the environment by reason of a more or less impervious shell the eggs of birds… …   Useful english dictionary

  • cleidoic — adj. [Gr. kleis, bar; oion, egg] Pertaining to an egg enclosed within a shell or membrane that is permeable only to gasses …   Dictionary of invertebrate zoology

  • cleidoic — adjective Etymology: Greek kleidoun to fasten, lock in, from kleid , kleis key more at clavicle Date: 1931 of an egg enclosed in a relatively impervious shell which reduces free exchange with the environment …   New Collegiate Dictionary

  • animal development — Introduction  the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by …   Universalium

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