As nouns the difference between amygdaloid and vendor

is that amygdaloid is a variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, especially agates, quartz, calcite, and the zeolites when the imbedded minerals are detached or removed by decomposition, it is porous, like lava while vendor is a person or a company that vends or sells.

As an adjective amygdaloid

is shaped like an almond.