Meaning of -ACT in English

-ACT

I. ˌakt adjective combining form

Etymology: Greek aktis ray — more at actin-

: having (such or so many) rays

poly act

tetr act

— in terms applied to sponge spicules

II. noun combining form

( -s )

: one having (such or so many) rays

hex act

tri act

— in names of sponge spicules

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.