土温

temperature of the soil

Tu (ethnic group) / surname Tu

earth / dust / clay / local / indigenous / crude opium / unsophisticated / one of the eight categories of ancient musical instruments 八音[ba1 yin1]

surname Wen

warm / lukewarm / temperature / to warm up / mild / soft / tender / to review (a lesson etc) / fever (TCM) / old variant of 瘟[wen1]