| transitional endoplasmic reticulum | <cell biology> Region at the boundary of the rough endoplasmic reticulum and the Golgi. Transport vesicles are responsible for the transfer of secretory proteins from this part of the rough endoplasmic reticulum to the Golgi system. (18 Nov 1997) |
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| transitional epithelium | A highly distensible pseudostratified epithelium with large polyploid superficial cells that are cuboidal in the relaxed state but broad and squamous in the distended state; occurs in the kidney, ureter, and bladder. (05 Mar 2000) |
| transitional gyrus | A small convolution connecting two lobes or two main gyri in the depth of a sulcus. Synonym: annectent gyrus, transitional convolution. (05 Mar 2000) |
| transitional leukocyte | Old term for a monocyte. (05 Mar 2000) |
| transitional zone | The equatorial region of the lens of the eye where the anterior epithelial cells become transformed into lens fibres, that portion of a scleral contact lens between the corneal and scleral sections. (05 Mar 2000) |