Tentacle sheath

(Zool.) a sheathlike structure around the base of the tentacles of many mollusks.

See also: Tentacle

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The majority of gymnolaemate bryozoans brood their embryos at one of four external sites: (1) attached to the external body wall, (2) in the tentacle sheath or vestibule, (3) in embryo sacs, or (4) in ovicells (Hyman, 1959; Strom, 1977; Reed, 1991).