1. The pivoted or swinging bar to which the traces of a harnessed horse are fixed; a whiffletree

Derived forms: singletrees

• 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
• yellow-blue color blindness
• yellow-blue colour blindness
• yellow-blue dichromacy
• yellow-breasted bunting
• yellow-breasted chat
• yellow-brown
• yellow-crowned night heron
• yellow-dog contract
• yellow-eyed grass
• yellow-eyed grass family
• yellow-fever mosquito