The word for Wednesday in Spanish is "miércoles".

Here are some details about it:

• It is a masculine noun, so it is usually preceded by "el" (the) when referring to "on Wednesday" (e.g., "el miércoles").

• The word "miércoles" comes from Mercury, the Roman god of messages and communication.

• Pronounced approximately as "mee-air-co-les" with the stress on the first syllable after the accent mark.

• Example sentences: "Hoy es miércoles" means "Today is Wednesday.".

If a pronunciation guide is helpful, it is like "mee-ER-co-les" with emphasis on the second syllable due to the accent mark on "é".