si·phun·cle (s  f ng k l)n. 1. A tubelike structure in the body of a shelled cephalopod, such as a nautilus, extending through each chamber of the shell. 2. A tubular organ on the abdomen of an aphid, from which a waxy fluid is secreted as a pheromone when the insect is attacked. Also called cornicle. [Latin s phunculus, diminutive of sph , sphn-, siphon; see siphon.]si·phun cu·lar (-ky-lr), si·phuncu·late (-l t) adj. |
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