dimerousadj.

/ˈdɪmərəs/

Forms: 1800s 2-merous, 1800s– dimerous.

Etymology: < French dimère (1817 in Cuvier, designating beetles with tarsi composed of two segments, < ancient Greek διμερής bipartite (in Aristotle)) + -ous suffix. Compare -merous comb. form. The form 2-merous in quot. 1870 at sense b may perhaps represent a separate word with the pronunciation /ˈtuːmərəs/ (compare five-merous adj.).

Consisting of two parts or divisions: spec.

a. Entomology. Having two joints: applied to the tarsus of an insect.

ΚΠ

1826 W. Kirby & W. Spence Introd. Entomol. (1828) IV. xlvii. 387 Tarsi mostly trimerous, rarely dimerous.

b. Botany. Of a flower: Having two divisions or members in each whorl. (Often written 2-merous.) Of a leaf: Consisting of two leaflets (rare).

ΚΠ

1845 J. Lindley School Bot. (1858) viii. 129 Flowers dimerous.

1869 Student 2 12 Polymerous leaves may be dimerous, trimerous, etc. according to their number of meriphylls.

1870 J. D. Hooker Student's Flora Brit. Islands p. x Papaveraceæ. Flowers regular 2-merous.

1872 D. Oliver Lessons Elem. Bot. (new ed.) ii. 174 Observe the dimerous symmetry of Enchanter's Nightshade (Circæa), the parts of the flower being in twos.

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 646 True tetramerous flowers are allied..to those with dimerous whorls.

1957 Encycl. Brit. IX. 410/2 A flower in which the parts are arranged in twos is dimerous; in threes, fours or fives, trimerous, tetramerous or pentamerous respectively.

This entry has not yet been fully updated (first published 1896; most recently modified version published online December 2020).

单词	dimerous
释义	dimerousadj. /ˈdɪmərəs/ Forms: 1800s 2-merous, 1800s– dimerous. Etymology: < French dimère (1817 in Cuvier, designating beetles with tarsi composed of two segments, < ancient Greek διμερής bipartite (in Aristotle)) + -ous suffix. Compare -merous comb. form. The form 2-merous in quot. 1870 at sense b may perhaps represent a separate word with the pronunciation /ˈtuːmərəs/ (compare five-merous adj.). Consisting of two parts or divisions: spec. a. Entomology. Having two joints: applied to the tarsus of an insect. ΚΠ 1826 W. Kirby & W. Spence Introd. Entomol. (1828) IV. xlvii. 387 Tarsi mostly trimerous, rarely dimerous. b. Botany. Of a flower: Having two divisions or members in each whorl. (Often written 2-merous.) Of a leaf: Consisting of two leaflets (rare). ΚΠ 1845 J. Lindley School Bot. (1858) viii. 129 Flowers dimerous. 1869 Student 2 12 Polymerous leaves may be dimerous, trimerous, etc. according to their number of meriphylls. 1870 J. D. Hooker Student's Flora Brit. Islands p. x Papaveraceæ. Flowers regular 2-merous. 1872 D. Oliver Lessons Elem. Bot. (new ed.) ii. 174 Observe the dimerous symmetry of Enchanter's Nightshade (Circæa), the parts of the flower being in twos. 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 646 True tetramerous flowers are allied..to those with dimerous whorls. 1957 Encycl. Brit. IX. 410/2 A flower in which the parts are arranged in twos is dimerous; in threes, fours or fives, trimerous, tetramerous or pentamerous respectively. This entry has not yet been fully updated (first published 1896; most recently modified version published online December 2020). < adj.1826
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