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From The Collaborative International Dictionary of English v.0.48:
Foraminifera \Fo*ram`i*nif"e*ra\, n. pl. [NL., fr. L. foramen, -aminis, a foramen + ferre to bear.] (Zool.) An extensive order of rhizopods which generally have a chambered calcareous shell formed by several united zooids. Many of them have perforated walls, whence the name. Some species are covered with sand. See Rhizophoda. [1913 Webster]