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[en-tuh-ruh p-noost, -nyoost] /ˈɛn tə rəpˌnust, -ˌnyust/
any of various invertebrate animals of the class Enteropneusta, comprising the acorn worms.
< New Latin Enteropneusta, equivalent to Greek entero- entero- + -pneusta, neuter plural of pneustós breathed, verbid of pneîn to breathe Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for enteropneust

acorn worm

any of the soft-bodied invertebrates of the class Enteropneusta, phylum Hemichordata. The front end of these animals is shaped like an acorn, hence their common name. The "acorn" consists of a proboscis and a collar that may be used to burrow into soft sand or mud. The animals vary in length from about 5 cm (about 2 inches) in certain Saccoglossus species to more than 180 cm (about 6 feet) in Balanoglossus gigas.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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