| 释义 |
epi·theca
\“+\ noun
Etymology: New Latin, from epi- + -theca
1. : an external calcareous layer investing the lower portion of the theca of many corals
2. : the outer or upper half or valve of the diatom frustule — compare hypotheca
• epi·thecal \“+\ or epi·thecate \“+\ adjective |