This is the 1096th most frequent Turkish word.
boyu
"Boyu" means "height" or "length" in English, depending on context.
In this sentence, 'boyu' is used to describe the height of an object, specifically the bookshelf.
Kitaplığın boyu biraz kısa.
The height of the bookshelf is a bit short.
Here, 'boyu' refers to the depth of the sea, which still relates to a measurement aspect.
Denizin boyu oldukça derin.
The depth of the sea is quite deep.
In this context, 'boyu' is used to denote the vertical extent or height of the tree.