What is "dactyle"

dactyl \dac"tyl\ (d[a^]k"t[i^]l), n. [L. dactylus, Gr. da`ktylos a finger, a dactyl. Cf. Digit.]

1. (Pros.) A poetical foot of three sylables (
   --- [crescent] [crescent]), one long followed by two short, or one accented followed by two unaccented; as, L. t["e]gm[i^]n[e^], E. mer"ciful; -- so called from the similarity of its arrangement to that of the joints of a finger. [Written also dactyle.]

2. (Zo["o]l.)

   1. A finger or toe; a digit.

   2. The claw or terminal joint of a leg of an insect or crustacean.