• سِدْر
• سِدْرَة

Appears 4 times in the Quran.

1. 34:16 فَأَعْرَضُوا۟ فَأَرْسَلْنَا عَلَيْهِمْ سَيْلَ ٱلْعَرِمِ وَبَدَّلْنَٰهُم بِجَنَّتَيْهِمْ جَنَّتَيْنِ ذَوَاتَىْ أُكُلٍ خَمْطٍ وَأَثْلٍ وَشَىْءٍ مِّن سِدْرٍ قَلِيلٍ

   But they turned aside, so We sent upon them a torrent of which the rush could not be withstood, and in place of their two gardens We gave to them two gardens yielding bitter fruit and (growing) tamarisk and a few lote-trees.
   

2. 53:14 عِندَ سِدْرَةِ ٱلْمُنتَهَىٰ

   At the farthest lote-tree;
   

3. 53:16 إِذْ يَغْشَى ٱلسِّدْرَةَ مَا يَغْشَىٰ

   When that which covers covered the lote-tree;
   

4. 56:28 فِى سِدْرٍ مَّخْضُودٍ

   Amid thornless lote-trees,