"piths" in the noun sense
soft spongelike central cylinder of the stems of most flowering plants
2. kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty
the choicest or most essential or most vital part of some idea or experience
"the gist of the prosecutor's argument"
"the heart and soul of the Republican Party"
"the nub of the story"
"piths" in the verb sense
remove the pith from (a plant)
Source: WordNet® (An amazing lexical database of English)
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