epithelium definition by Wordo

Noun

A

membranous

tissue

composed

of

one

or

more

layers

of

cells

which

forms

the

covering

of

most

internal

and

external

surfaces

of

the

body

and

its

organs

:

internally

including

the

lining

of

vessels

and

other

small

cavities

,

and

externally

being

the

skin

.