The Portuguese word for floor is
chão

Gender

The gender of chão is masculine. E.g. o chão.

Plural

The plural of chão is chãos.

Portuguese Definition

floor
1. Substantivo. chão, piso, assoalho
2. Substantivo. andar
3. Substantivo. (Ginástica) solo
4. Verbo. cobrir o chão de um cômodo

Translations for floor and their definitions

andar
1. v. to walk (to move on one’s feet)
Estive andando o dia todo, procurando por você. - I’ve been walking all day, looking for you.
2. v. (indtr, em, por, direct=1, qualdirect=somewhat formal) to walk (to travel through a given path)
Já andei essa estrada mil vezes. - I’ve walked this road a thousand times.
3. v. (indtr, de) to ride; to take; to travel by (to use a given mode of transportation)
Ela está andando de ônibus para economizar tempo. - She’s traveling by bus to save time.
Andamos de cavalo ontem. - We rode horses yesterday.
4. v. (copulative) to habitually or continuously be in the given state
Bons amigos sempre andam juntos. - Good friends are always together.
Ele anda deprimido. - He has been depressed.
5. v. (auxiliary) to have been (to habitually or continuously do something)
Ele anda tentando consertar aquele carro. - He has been trying to fix that car.
6. v. (indtr, por) to be around; to be to (to visit or be within a given area)
Eu já andei pela França e Itália. - I’ve already been to France and Italy.
Faz algum tempo que o xerife não anda por aqui. - It's been some time since the sheriff has been around here.
7. v. (indtr, com, intr=1) to hurry up (with) (to do something more quickly)
Anda! - Hurry up!
Preciso de andar com o projeto. - I need to hurry up with the project.
8. v. to proceed; to pass; to go on (to continue in action)
Os meses andam e eu continuo nesta situação. - The months pass and I continue on this situation.
Esta fila não anda. - This queue doesn’t move.
9. v. to function; to work
Há meses que o meu relógio não anda. - My clock hasn’t been working for months.
10. n-m. floor, storey (level of a building)
11. n-m. (Portugal) apartment, flat
12. n-m. gait, walk (manner of walking)

piso
1. n-m. storey (level of a building)
2. n-m. floor (lower part of a room)
3. n-m. surface (to walk on)
4. v. verb form of pisar

chão
1. n-m. ground, soil, earth
2. n-m. floor
Não deixe cair nada no chão. - Don't let anything fall to the floor.
3. n-m. (poetic) land
Este é o nosso chão. - This is our land.
4. n-m. (geography, obsolete) plain
5. n-m. (Brazil, informal) a period of time between the present and a future event
Ainda tem um chão até o dia de eu me mudar. - There is still some time until the day I will move.
6. adj. flat, level, even, smooth