pith

US /pɪθ/
UK /pɪθ/
"pith" picture
1.

the essential or central part of something

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The editor's job is to extract the pith of the argument.
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His speech lacked pith and substance.
:
essencecoreheartcruxgist
2.

the white, spongy tissue lining the rind of citrus fruits

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When peeling an orange, try to remove as much of the white pith as possible.
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The bitter taste often comes from the pith.
1.

to remove the pith from (fruit or wood)

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You need to pith the oranges before making the marmalade.
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The carpenter carefully pithed the wood to prepare it for carving.
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pith helmet