for·a·min·i·fer 
(fôr′ə-mĭnə-fər, fŏr′-) also fo·ram·i·nif·er·an (fə-răm′ə-nĭfər-ən)
(fôr′ə-mĭnə-fər, fŏr′-) also fo·ram·i·nif·er·an (fə-răm′ə-nĭfər-ən)n.
Any of numerous chiefly marine protozoans of the order (or phylum) Foraminifera, characteristically having a calcareous shell with perforations through which numerous pseudopods protrude. The shells accumulate on the ocean floor as sediment.
[From New Latin Forāminifera, order name : Latin forāmen, forāmin-, an opening + Latin -fer, -fer.]
fo·ram′i·nifer·al adj.