What is (a) The embryo produced directly from the egg in a metagenetic series, especially the larva of a tapeworm or other parasitic worm. See Illust. of Echinococcus. (b) One of the Scolecida called?

scolex — (a) The embryo produced directly from the egg in a metagenetic series, especially the larva of a tapeworm or other parasitic worm. See Illust. of Echinococcus. (b) One of the Scolecida. (Webster's 1913.)

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