1. Existing by nature and without artificial aid
   "one of the 93 naturally occurring chemical elements"

See also: present

• yellow sand verbena
• Yellow Sea
• yellow spiny daisy
• yellow spot
• yellow spot fungus
• yellow spruce
• yellow squash
• yellow star-thistle
• yellow sweet clover
• yellow trefoil
• yellow trumpet
• yellow turnip
• yellow twining snapdragon
• yellow vetchling
• yellow warbler
• yellow water flag
• yellow water lily
• yellow watercress
• yellow woman
• yellow-banded
• yellow-beige
• yellow-bellied
• yellow-bellied sapsucker
• yellow-bellied terrapin
• yellow-blindness