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| the basinlike cavity in the lower part of the trunk of many vertebrates, formed in humans by the innominate bones, sacrum, etc. |
| the innermost digit of the forelimb; thumb. |
contactant con·tac·tant (kən-tāk'tənt)
n.
Any of a group of allergens that elicit manifestations of induced sensitivity by direct contact with the skin or mucosa.