kind of white wine
泲 refers to a specific kind of white wine. Its meaning is narrow and concrete, without broader abstract extensions.
泲 combines the water radical 氵 with a phonetic element 㐪 (or a related form). The exact historical development of the right-side component is uncertain, but the character likely originated as a phono-semantic compound for a type of liquid.
The left side 氵 (water) suggests a liquid. Picture a special white wine being poured from a vessel shaped like the right side 㐪.
For セイ, imagine saying 'say' (セイ) when offering a glass of this white wine: 'Say when!' as you pour.
—