From sphygmo- + -oid. <span class="searchmatch">sphygmoid</span> (comparative more <span class="searchmatch">sphygmoid</span>, superlative most <span class="searchmatch">sphygmoid</span>) pulse-like hypodigms...
sphygmo- sphygm- + -o- English terms prefixed with sphygmo- sphygmography <span class="searchmatch">sphygmoid</span> sphygmophone sphygmoscope...