actinomorphicadj.
/ˌaktᵻnə(ʊ)ˈmɔːfɪk/, U.S. /ˌæktənoʊˈmɔrfɪk/ Botany.
Esp. of a flower: having radial symmetry. Opposed to zygomorphic.
ΘΚΠ
the world > plants > part of plant > (defined by) distribution, arrangement, or position > [adjective] > monosymmetrical or polysymmetrical
monosymmetrical1875
polysymmetrical1875
actinomorphous1879
actinomorphic1880
polysymmetric1992
1880 S. H. Vines tr. K. Prantl Elem. Text-bk. Bot. iv. 189 The flower is regular or actinomorphic [Ger. ist die Blüthe regelmässig], that is, the halves produced by all possible sections are similar.
1952 P. Mann Systematics Flowering Plants ii. 78 The flowers are hermaphrodite, and usually actinomorphic.
2001 Ann. Bot. 88 1186/1 There is an evolutionary trend from monosymmetric (zygomorphic) to polysymmetric (actinomorphic) flowers or vice versa.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).
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