Sister – hermana
Pronounced ehr-mah-nah (remember the "h" is silent in Spanish)
To remember that sister is pronounced ehr-mah-nah (hermana) in Spanish, use the following mnemonic:
She looked very different to her sister and her manner (hermana) was totally different too.

It's so obvious that hermana is feminine (la hermana) that we decided not to include a "lady" image for this one.
Examples of hermana (sister) in a sentence
Mi hermana es muy inteligente y amable.
(My sister is very intelligent and kind.)
¿Tienes una hermana mayor o menor?
(Do you have an older or younger sister?)
Mi hermana y yo siempre comemos juntas los domingos.
(My sister and I always eat together on Sundays.)