it depends what you mean by the bottom part.... are you talking about the stem, roots, ect?
The bottom of a celery plant is called the "base" or "crown." It is the part from which the stalks grow and is often where the roots emerge. In culinary terms, this section is sometimes referred to as the "root end" when preparing celery for cooking or eating.
The top part of a wave is called the crest, while the bottom part is called the trough.
The bottom of the food chain is the plant or the producer.
The bottom part of a cake is called the base.
Denominator. The top part is called the numerator.
a bottom (body part) is called 'un derrière' (masc.) in French
Hem.
a Hull
The part of the potato plant we eat is called the tuber, which is actually an enlarged underground stem.
well the leaves the mini dots at the bottom part of it does the job
The bottom part of your hand is the Palmar sideand the top part is the Dorsal side.
its called a lowbret