‖ n. [ Pref. arch- + Gr. &unr_; intestine. ] (Biol.) The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination. [ 1913 Webster ]
‖n. [ NL. See Meso-, and Enteron. ] (Anat.) All that part of the alimentary canal which is developed from the primitive enteron and is lined with hypoblast. It is distinguished from the stomodaeum, a part at the anterior end of the canal, including the cavity of the mouth, and the proctodaeum, a part at the posterior end, which are formed by invagination and are lined with epiblast. [ 1913 Webster ]
[すなやつめ;スナヤツメ, sunayatsume ; sunayatsume] (n) (uk) Far Eastern brook lamprey (Lethenteron reissneri); sand lamprey (species found in the Northwest Pacific) [Add to Longdo]
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