glove
The French word for glove is 'gant'. It is a masculine noun and is used to refer to a covering for the hand, often made of leather or cloth. The plural form of 'gant' is 'gants'. It is important to note that in French, adjectives usually come after the noun they modify, so a 'gant rouge' would be a 'red glove' in English.
I forgot my gloves at home.
This sentence is talking about forgetting a pair of gloves at home. The speaker uses the word 'mes' because gloves usually come in pairs. In French, the noun 'gant' is masculine although it can be referring to a pair of gloves.
The baseball glove is in the locker.
In this sentence, we learn the speaker is referring to a specific baseball glove which is in a specific locker. The word 'le' is used to indicate specificity. 'Gant de baseball' means baseball glove in English, and 'le casier' means 'the locker'.
She put on a glove to open the door.
Here, the speaker is describing a situation in which a lady had to put on a glove before opening a door. The verb 'mis' is the past participle of the verb 'mettre' which means 'to put'. As a result, in English this sentence reads 'She put on a glove to open the door'.