• (a.) Of or pertaining to a theca; as, a thecal abscess.
A case, covering, or sheath, such as the pollen sac of an anther or the spore case of a moss.
Relating to a sheath, especially a tendon sheath. ... Origin: see theca ... (05 Mar 2000) ... 
The'cal adjective Of or pertaining to a theca; as, a thecal abscess. 
Type: Term Pronunciation: thē′kăl Definitions: 1. Relating to a sheath, especially a tendon sheath.
thecal Referring to a theca.