名词赤木质，心材
heartwood的反义词
1. 赤木质;心材：hearthstone 炉石;炉边 | heartwood 赤木质;心材 | heat absorption 热吸收
2. 赤木质：heartthrob 心跳 | heartwood 赤木质 | hearty 衷心的
3. 中心木质：heartcam心形凸轮 | heartwood中心木质 | hearth锻工炉
noun
1. the older inactive central wood of a tree or woody plant
usually darker and denser than the surrounding sapwood
Synonym: duramen