Definitions
Century Dictionary and Cyclopedia
- Belonging to the hedgehog family; resembling a hedgehog.
Wiktionary
- adj. Of, pertaining to, or resembling a hedgehog.
GNU Webster's 1913
- adj. Of the Hedgehog family; like, or characteristic of, a hedgehog.
Examples
“And while she knows a lot of big words like erinaceous, she's also very good at simplifying them: "Serendipity is when you find things you weren't looking for because finding what you are looking for is so damned difficult.”
“Where to start ... the first thing I saw that I really wanted (and of course it was sold out) were these hedgehog notecards (so erinaceous!) from Papered Together.”
“We've already showed you how easy searching Google's dictionary is: just type, for example, define erinaceous to get a straight-out-of-the-dictionary definition for "erinacious".”
Lists
These user-created lists contain the word ‘erinaceous’.
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Adjectival Arcana
A roster of adjectives that infrequently surface in typical conversation and writing. Many are dredged from scientific or other technical jargon or sieved from examples of disused archaic forms.
unitegmic, acaulescent, reticuloendothelial, ingressive, uniate, acanthopterygian, ossific, epiphysial, perivisceral, acœlomatous, cestoid, acælomate and 7762 more...
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Logolepsy
"Luciferous Logolepsy is a collection of over 9,000 obscure English words. Though the definition of an 'English' word might seem to be straightforward, it is not. There exist so many adopted, deriv...
Anschauung, Areopagus, Argus, Briarean, Dei gratia, Dei judicium, Deo volente, Duecento, Foehn, Geflugelte Worte, Gegenschein, Hakenkreuz and 9230 more...
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Erins
erin, Erin, erinaceous, engineering, Erinyes, covering, helicoptering, Erin go Bragh, hemosiderin, inelastic scattering, pioneering, Kaiserin and 31 more...
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Animal Descriptors
Do any of your friends eat like a pig? Sly like a fox? Fast as a cheetah? Maybe these words describe them better
erinaceous, alaudine, phocine, porcine, accipritine, acarine, alopecoid, anatine, anguine, anopheline, apian, arietine and 80 more...
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Varsha's List
purlicue, erinaceous, floccinaucinihili..., inaniloquent, nihilarian, nudiustertian, pulveratricious, selcouth, rastaquouere, tyrotoxism, widdiful, fidimplicitary
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Words that should be heard in songs more often
Inspired by PossibleUnderscore's list of words overused in modern pop music.
giant squid, bamboo, colonic, herbivore, raptor, dodecahedron, largesse, sinuses, dim sum, carburetor, transubstantiation, wife and 54 more...
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-acean, -aceous
of the nature of; like; characterized by; belonging to
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idontneedaname's list

sionnach I'd go with tiggy-winkly. Or, since another term for hedgehog is the nicely palindromic gipsy's pig, possibly tziganoporcine. Here is a video of Erin, speaking at that Monterey conference for bigwigs:
Erin McKean on redefining the dictionary Jul 22, 2008
frindley A parallel here with phascolomian and wombastic. Mar 30, 2008
jrome Erin McKean's favorite word. I myself prefer "hedgehoggy." Mar 14, 2007