te·tram·er·ous /tɛˈtræmərəs/
四部分; 四重
Te·tram·er·ous a.
1. Bot. Having the parts arranged in sets of four; as, a tetramerous flower.
2. Zool. Having four joints in each of the tarsi; -- said of certain insects.
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tetramerous
adj : having or consisting of four similar parts; tetramerous
flowers