gelatinous sheath

См. также в других словарях:

• desmid — desmidian, adj. /dez mid/, n. any single celled freshwater algae of the family Desmidiaceae, characterized by a division of the body into mirror image halves joined by a bridge containing the nucleus, and having a spiny or bristly exterior:… …   Universalium

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• egg-pod — (ARTHROPODA: Insecta) Frothy secretions that form the egg mass of grasshoppers and the gelatinous sheath of dipteran eggs …   Dictionary of invertebrate zoology

• sea lettuce — any seaweed of the genus Ulva, having large leaflike blades. [1660 70] * * * ▪ algae genus  (Ulva), a genus of green algae usually found growing on rocky shores of seas and oceans. Some species also grow in brackish water rich in organic matter… …   Universalium

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• human embryology — ▪ biology Introduction       the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth.       The human body, like that of most animals, develops from a single cell produced by the union of… …   Universalium

• substance — Stuff; material. SYN: substantia [TA], matter. [L. substantia, essence, material, fr. sub sto, to stand under, be present] alpha s. SYN: reticular s. (1). anterior perforated s. [TA] a region at the base …   Medical dictionary