Sentence:  The street that is full now of traffic and parked cars then and for many years drowsed on an August afternoon in the shade of the curbside <WSD>trees</WSD> , and silence was a weight , almost palpable , in the air . 
Meaning of the word marked with <WSD> tags:  a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms