1) Exclusively Saxon word 2) Exclusively Anglo word 3) Word of purely Anglo origin 4) Word with Anglo-Saxon origins 
• (n.) A peevish, ill-natured person. • (n.) A spider.
At'ter·cop noun [ Anglo-Saxon attercoppa a spider; ǣtter poison + coppa head, cup.] 1. A spider. [ Obsolete] 2. A peevish, ill-natured person. [ North of Eng.]
Attercop is an old name for a poison spider. The word specifically refers to a poisonous spider, and not simply a spider, as the two parts are old Anglo-Saxon, 'atter' meaning poison and 'cop' meaning spider.Attercop (poison spider) was old slang for a bad-tempered, anti-social person who ruined all social events at which he or she was present.