1Biology. In sponges, a mass of protoplasm that supposedly consists of a syncytium (now historical and rare ). In later use: an organism consisting of a syncytium, as a slime mould ( rare ).
2Zoology. A protist of the division Sarcodina.
adjective
Zoology. Of or relating to the protist division Sarcodina; designating protists of this division.
Origin
Late 19th century; earliest use found in Ernst Haeckel (1834–1919). From sarcode + -ine.