名詞 ocellus:

1. an eye having a single lens
   同義詞：simple eye, stemma
2. an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color
   同義詞：eyespot

o.cel.lus

n.（名詞）
【復(fù)數(shù)】 o.cel.li[ô-sμl.o.]
A small simple eye, found in many invertebrates, usually consisting of a few sensory cells and a single lens.
單眼：小而簡(jiǎn)單的眼，出現(xiàn)于多種無脊椎動(dòng)物，通常含有一些感官細(xì)脆和單一眼睛水晶體
A marking that resembles an eye, as on the tail feathers of a male peacock; an eyespot.
眼狀斑：象眼睛似的斑，如在雄孔雀的尾部的羽毛上

來源：
Latin [diminutive of] oculus [eye] * see ok w-
拉丁語 [] oculus的小后綴 [眼] *參見 ok w-

【引伸】
ocel.lar