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Use "emargination" in a sentence
"In any case, it was easy to love the evidence in my hands: the emargination of the sixth primary of chiffchaffs, the blue-gray of the moulted greater coverts of first-year great tits, the reddish iris color of adult dunnocks, the fat keels of sedge warblers."
"Ocular emargination: in Mallophaga, a lateral emargination of the head in which the eye is received posteriorly."
"Ocular fringe: in Mallophaga, closely set small hair on posterior half of ocular emargination, sometimes extending on temporal margin."