Body parts that come in pairs are feminine, both in the dual and singular forms.

Lip

شَفَةٌ

Ear

أُذُنٌ

Hand

 

يَدٌ  

Foot

قَدَمٌ

Leg

رِجْلٌ

Eye

عَيْنٌ

Shin

ساقٌ 

Cheek

خَدٌّ

Elbow

مِرْفَقٌ

Ankle

کَعْبٌ 

Heel

عَقِبٌ

Shoulder

مَنْکَبٌ