periderm

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per·i·derm

, periderma (per'i-derm, -i-dĕr'mă),
The outermost layer of the epidermis of the embryo and fetus to the sixth month of intrauterine life; desquamated peridermal cells are a considerable component of the vernix caseosa.
Synonym(s): epitrichium
[peri- + G. derma, skin]

periderm

/peri·derm/ (per´ĭ-derm)
1. the outer layer of the bilaminar fetal epidermis, generally disappearing before birth.
2. the cuticle (eponychium and hyponychium), the only part of the periderm persisting after birth.periderm´al

periderm

[per′idurm]
the outermost layer of flattened epidermis on an embryo or fetus during the first 6 months of gestation.

periderm

A transiently expressed superficial layer that surrounds the developing epidermis.

per·i·derm

, periderma (per'i-dĕrm, -dĕr'mă)
The outermost layer of the epidermis of the embryo and fetus up to the sixth month of intrauterine life; desquamated epitrichial cells are a considerable component of the vernix caseosa.
Synonym(s): epitrichium.
[peri- + G. derma, skin]

periderm

a protective tissue formed in roots and stems that has undergone SECONDARY THICKENING, consisting of an outer cork zone, an underlying phellogen (cork cambium) and with a phelloderm (secondary cortex) beneath that.

periderm

the outer layer of the bilaminar fetal epidermis, generally disappearing before birth. Called also epitrichium.
References in periodicals archive ?
In the living tree, as new phloem is formed, the older phloem undergoes anatomical changes and becomes obliterated phloem as it is sealed off by developing periderms (Howard 1971).
During preliminary experiments, whole bark meals were subjected to a variety of different grinding operations with the blender to determine whether the action of the rotating blade would preferentially grind the seemingly delicate phloem and obliterated phloem tissues more than the harder periderms with their interlocking spiculate stone cells (sclereids).
Their findings showed that the fertile-zone morphological modifications correspond to several anatomical ones, especially in relation to the early development of periderm and loss of fibers in the secondary xylem and phloem.
These lignified cells are not associated with the development of a periderm.