Englishfor English speakers
titter
—
verb
(= giggle)
laugh nervously
The girls giggled when the rock star came into the classroom
—
noun
a nervous restrained laugh
of
Preposition
—
Made using.
It is a house of cards.
antibody
—
noun
any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response