This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
曎 combines 日 (sun) with 睪, which likely contributes the sound. The exact historical development is uncertain, and the character is rare.
The sun 日 beside the complex 睪 shape suggests something related to light or shining, but the exact meaning is uncertain.
For エキ, imagine the sun 日 emitting a mysterious liquid (エキ, 液) that makes things shine: 液 -> エキ, and the sun's rays are like a glowing extract.