Zool. [irreg. f. Gr. σύν SYN- L. cilium (see CILIA): cf. CNIDOCIL, PALPOCIL.] A structure in certain sponges, supposed to be a sense-organ, perhaps analogous to the rods and cones of the retina of the eye: see quot. 1888.
1883. Simmonds, Dict. Trade, Suppl.
1888. Rolleston & Jackson, Anim. Life, 807. A synocil, as yet observed only in a Sycandra, is a process of mesoglaea,… containing a number of fine filaments derived from as many cells situate at its base.
