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This add-on previously supported Anki 2.0. You can download the last version supporting 2.0 here. As Anki 2.0 has been discontinued, no support is available for this version.
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I recommend to add the update here https://github.com/weirdalsuperfan/Sanseido-Definitions
Updated version (more up to date than the one below) that supports multiple words in your expression, e.g.: 一部・大部分・部分 or even whole sentences. Also includes ふりがな in the definitions, and fixes a couple bugs.
Here is a fix for the plugin !!
I've been using this plug-in for a while now, thanks for your work.
Just a heads up that sanseido has switched from .net to .biz, so this add-on won't work out of the box anymore.
To fix it, open the sanseidoDefsForAnki python file (it's in your anki add-ons directory) with a text-editor of choice, look for "sanseido.net", replace with "sanseido.biz", save and restart Anki. Only the Sanseido domain name changed, the internal logic remains the same so nothing else needs to be edited.
I changed the fields to suit my deck and it worked a treat. Extremely useful. Thank you!!