الثلاثاء

You say 'Tuesday' in Arabic as الثلاثاء (ath-thulathāʾ).

الثلاثاء is considered a masculine noun in Arabic.

You can use الثلاثاء just like you would use 'Tuesday' in English. For example:
اليوم هو الثلاثاء. (Today is Tuesday.)
سأراك يوم الثلاثاء. (I will see you on Tuesday.)

No, days of the week like الثلاثاء do not typically have plural forms in Arabic when referring to the day itself.

The pronunciation is roughly 'ath-thoo-la-thaa'. The 'th' sound is like in 'think', and the 'aa' at the end is a long 'a' sound.

الثلاثاء comes from the Arabic root for 'three' (ثلاثة - thalātha), as Tuesday is the third day of the week in the Islamic calendar.

A common phrase would be 'يوم الثلاثاء' (yawm ath-thulathāʾ), which means 'on Tuesday' or 'Tuesday'.

Yes, الثلاثاء is the standard word for Tuesday across all Arabic-speaking countries.

It is written as اَلثُّلَاثَاءُ. Pay attention to the two 'alifs' at the beginning and end, and the 'tha' sound in the middle.

Before الثلاثاء is الاثنين (al-ithnayn - Monday), and after it is الأربعاء (al-arbiʿāʾ - Wednesday).