Definition of "coccoid"

( C ) Field emission SEM image of a coccoid bacterium on a 0.02-µm Anopore filter viewed at a magnification of ×150,000 in the decontaminated ice melt.

1999 December 10, “Microorganisms in the Accreted Ice of Lake Vostok, Antarctica”, in Science‎, volume 286, number 5447, pages 2144–2147