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paleontography
paleontol.
paleontology
paleopathology
Paleosiberian
Paleozoic
paleozoology
Palermo
Palestine
palestra
palette
palette knife
palfrey
Pali
pali
palimony
palimpsest
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palisade layer

pal·i·sade lay·er (plural pal·i·sade lay·ers) or pal·i·sade mes·o·phyll (plural pal·i·sade mes·o·phylls) or pal·i·sade pa·ren·chy·ma (plural pal·i·sade pa·ren·chy·mas)


noun 
Definition:
 
chlorophyll-rich layer in leaves: a layer of long cells under the upper epidermis of a leaf that are full of specialized chlorophyll-containing cell parts chloroplasts

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