Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. having twelve plane surfaces
from the GNU version of the Collaborative International Dictionary of English
 adj. Pertaining to, or like, a dodecahedion; consisting of twelve equal sides.
from The Century Dictionary and Cyclopedia
 Having the form of a dodecahedron: as, the dodecahedral cleavage of sphalerite. Also duodecahedral.
Etymologies
Examples

A strange looking dodecahedral object, the size of a small room, descends gently from above and thumps down with a rattle of its instruments.

For the 120cell the boundary space is SO (3)/A_5 for A_5 the alternating group of the dodecahedral group.

There is a pattern for a knitted dodecahedral ball out there, though.

Importantly, calculations for a dodecahedral universe predict that this is the angle you would see.

Unfortunately, out of the some 20,000 new books published each year in the United States  of which a daily paper can review perhaps 450  only about three will be in any way solipsistic, dodecahedral, or prelapsarian.

I am going to hold my ground here, suffer in decimal mode until campy comes out with a dodecahedral speed drive system

The Quintrino is a dodecahedral shape with a large and hidden inner volume.

On the other hand, Roukema et al. 2004 performed the same analysis for smaller circles, and found six pairs of matched circles distributed in a dodecahedral pattern, each circle on an angular size about 11◦.

The Platonic bodies have often served as patterns, and hydrocarbons had already been synthesised as tetrahedral, cubic or dodecahedral (12sided) structures.

She had tilted and canted the dodecahedral segments of her body so that they reflected as little light as possible.
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