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urticating hair
Urticating hairs or urticating bristles, i.e. irritating hairs, are one of the primary defense mechanisms used by numerous plants, some New World tarantulas, and various lepidopteran caterpillars. ''Urtica'' is Latin for "nettle" (stinging nettles are in the genus ''Urtica''), and hairs that urticate are characteristic of this type of plant, and many other plants in several families. This term also refers to certain types of barbed hairs that cover the dorsal and posterior surface of a tarantula's or caterpillar's abdomen. Many tarantula species eject hairs from their abdomens, directing them toward potential attackers. These hairs can embed themselves in the other animal's skin or eyes, causing physical irritation, usually to great discomfort.
==In plants==
The most common form of urticating hairs in plants are typified by nettles, which possess sharp-pointed hollow hairs seated on a gland which secretes an acrid fluid. The points of these hairs usually break off in the wound, and the acrid fluid is pressed into it. Various plants unrelated to true nettles (''Urtica'' species) possess similar defensive hairs, and the common names often reflect this (e.g., "bull nettle").
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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