10B.70-5
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(2) Name of anc. country, dwelled by descendants of [xia4] 夏 Dyn.: 杞人憂天 (abbr. into 杞憂) (allu.) a man of 杞 worried that the sky might fall down--superfluous worry.
(3) A kind of willow;
see compp.↓.
2.杞梓 [qi2zi3], n., a kind of fine wood, good for making woodblocks for printing; see 梓 10B.10.