Words that start with S

You see something if you can tell it is there, using your eyes. Being able to see means you have the sense of sight. Someone who cannot see is blind.

A seer is a person who can see the future, or who has profound insight or knowledge.
A similar word to seer is prophet.

A segment is a part of something that can be divided off naturally, without cutting. Oranges and mandarins can be easily broken into segments. You can clearly see the segments of the mandarin in the picture.
Segments can also be used to describe parts of some kinds of a creepy crawly like a millipedes body, where there are clear separations between the parts.

You send something when you make it go somewhere. You send a parcel by taking it to a post office. You send out your troops by ordering them to go.

A sentence is something someone has said you must do as a punishment. The man in the picture has been sentenced to some time in jail.

A sentry is someone who stands guard over something, to protect it. The sentry in this picture is guarding the entry to the Tower of London, which contains the Queen's jewels.

September is the ninth month of the year. It has 30 days. The next month of the year is October. In the northern hemisphere September is part of autumn, and in the southern hemisphere it is part of spring.

A serpent is another word for snake, especially in historical or fantasy context.

Sesame seeds are the seeds of a plant from Africa and India that grows to about a metre high. The seeds can be pressed to extract the oil but are used most often sprinkled on other foods as a flavour and garnish. You often see them stuck to the top of loaves of bread.
The sesame seeds in the picture are on top of some cooked spinach.

Something is seventh if it is the number seven item in a list. Seventh comes after sixth and before eighth.