pentagon-dodecahedronn.
/ˌpɛntəɡ(ə)nˌdəʊdɛkəˈhiːdr(ə)n/, U.S. /ˈˌpɛn(t)əˌɡɑnˌdoʊˌdɛkəˈhidr(ə)n/ Chiefly Crystallography.
A dodecahedron which has twelve pentagonal faces but is not a regular dodecahedron; a solid figure or structure of this form.
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the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > contained by pentagons
pentadodecahedron1869
pentagon-dodecahedron1895
pentagonohedron1895
1895 N. Story-Maskelyne Crystallogr. §183 The pentagon-dodecahedron approximates..to the regular dodecahedron of geometry in proportion as the dihedral angles..approach equality... The regular dodecahedron.., impossible as a crystallographic form, is the limiting figure between the two classes of pentagon-dodecahedra.
1975 Thermochimica Acta 11 60 By X-ray evidence, the introduction of a third Ni disrupts the pentagon dodecahedron of H20 molecules.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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n.1895