心材

xīncái
  1. pith
  2. central core (of tree)

CEDICT

heartwood

Wiktionary

树干中央部分的木材，内为髓心，外为边材。因为化学物质沉淀，颜色较浓。

重編國語辭典

Entry Composition

1 心 xīn
  1. heart
  2. mind
  3. intention
  4. center
  5. core

classifiers: 顆, 個
2 材 cái
  1. material
  2. timber
  3. ability
  4. aptitude
  5. a capable individual
  6. coffin (old)

Related entries

髓 suǐ
  1. (bound form) bone marrow; (fig.) innermost part
  2. (botany) pith
重心 zhòngxīn
  1. center of gravity
  2. central core
  3. main part