What is the meaning of Dactylus?

Synonym of dactyl (type of metrical foot)

dactyl

a sort of muscle

a kind of grape

a sort of grass

a precious stone

the date

a dactyl (¯ ˘ ˘), one long followed by two short, or one accented followed by two unaccented; this came to be in an allusion to the three joints of the finger

finger-like; fingered.

Source: wiktionary.org