dactyly

is likely misspelled.

has no English definition.

As a noun dactyly

is the number and arrangement of digits (fingers and toes) on the hands, feet, or sometimes wings of a tetrapod animal.

As nouns the difference between dactyls and dactyly

is that dactyls is while dactyly is (biology) the number and arrangement of digits (fingers and toes) on the hands, feet, or sometimes wings of a tetrapod animal.

As nouns the difference between dactyl and dactyly

is that dactyl is a poetical foot of three syllables (— ~ ~), one long followed by two short, or one accented followed by two unaccented while dactyly is the number and arrangement of digits (fingers and toes) on the hands, feet, or sometimes wings of a tetrapod animal.