Synonym: center, core, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nitty-gritty, nub, substance, sum. Similar words: pithy, pithead, epithet, pithily, pit, pity, spit, spite. Meaning: [pɪθ] 
n. 1. soft spongelike central cylinder of the stems of most flowering plants 2. the choicest or most essential or most vital part of some idea or experience. v. remove the pith from (a plant).
n. 1. soft spongelike central cylinder of the stems of most flowering plants 2. the choicest or most essential or most vital part of some idea or experience. v. remove the pith from (a plant). 
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(1) That was the pith of his argument.
(2) The pith of his speech was focused on the importance of education.
(3) Using a sharp knife, cut away the pith and peel from both fruits.
(4) The pith helmet with an attentive elephant in waiting.
(5) Remove the skin and white pith and eat as it is for a simple, refreshing dessert.
(6) We tried taking out the pith from behind the bud, and we tried leaving it in - it made little difference.
(7) Two men in pith helmets stood on a canal towpath slapping each other's faces with fish in time to music.
(8) The blanched pith soaked up the sugar syrup during the candying process and turned out to be spectacular.
(9) Cut the peel and pith from the remaining two oranges and cut out the segments from each orange.
(10) Peel 3 more oranges(sentencedict.com/pith.html), cutting away all the pith and membrane. Cut into segments and add to the melon.
(11) Peel 3 more oranges, cutting away all the pith and membrane.
(12) Tangerine pith is good for one's health.
(13) The pith of that theory is serving for people.
(14) Judging from its appearance[sentencedict.com], it must be the pith.
(15) The inmost, choicest, or essential part; the pith.
(16) Digital Signal Process is the spirit and pith of all the software radio.
(17) The characteristics of the size of pith, the ratio of pith and the ratio of tegument vs. xylem have drastic variation among the three hybrid combinations of Dongzao seedlings.
(18) Peel the oranges with a sharp knife to remove all pith.
(19) But do take care to remove all the white pith as this can make wine bitter tasting.
(20) Using a sharp knife, remove all of the white pith, which is quite bitter.
(21) The only real difference would be that the colonial governors sent to deal with the locals back then usually wore pith helmets.
(22) Finally we both got fed up and left the pith on half the peel.
(23) Remove zest from orange and lemon; avoid the bitter white pith.
(24) Coming out of our back door and making a frozen spread across the pith, came trickling water.
(25) The citron has the most beautiful fragrance of all the citrus fruits and its pith is not bitter.
(26) Small wonder that doctors are calling for the return of the parasol and pith helmet.
(27) Ferreous mesua is qualitative firm and heavy, duramen is damask, pith line fine beauty, make furniture with its, wear well.
(28) Heartwood is the mature wood, which is often darker, extending from the sapwood to the pith.
(29) Latent root primordium was not found in shoots in test tubes. The induced root primordium which originated from the division and differentiation of pith ray cell developed into the adventitious roots.
(30) Refined tortoise and turtle tonic paste prepared from a - hundred - year - old pith a superfine product promoting longevity.