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tetrachaenium
tetrachaenium n.
Brit. 
/ˌtɛtrəˈkiːnɪəm/
, /ˌtɛtrəˈkiːnɪəm/U.S. /ˌtɛtrəˈkiniəm/
(pl. tetrachænia) Botany, pl. a fruit formed of four adherent achenes. [ < scientific Latin tetrachaenium (1847 or earlier), tetrachenium (1831 or earlier), tetrakenium (1824 or earlier) < tetra- tetra- comb. form + akenium achenium n.; compare French tétrakène (1822 or earlier), German Tetrakene (1828 or earlier).] /ˌtɛtrəˈkiniəm/ΘΚΠ
the world > plants > part of plant > reproductive part(s) > fruit or reproductive product > [noun] > indehiscent fruit or achene
key1440
samara1577
achenium1819
achene1825
caryopsis1830
key fruit1849
tetrachaenium1856
cremocarp1861
Cypsela1861
achaenocarp1874
triachaenium1882
pseudospermium1890
1856 J. S. Henslow Dict. Bot. Tetrachænium.., a fruit formed by the separating of a single ovary into four nuts; as in the Labiatæ.
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as lemmas