Having no light, especially no sunlight; specifically (biology, oceanography) describing that part of deep lakes and oceans where less than one per cent of sunlight penetrates and where photosynthesis is not possible.

(biochemistry, of a protein) In an inactive, unbound state

(mineralogy) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer, as a gemstone, and (in powdered form) as a pigment.

A small apartment attached to or carved out of a nominally single-family house, ostensibly intended for occupancy by a mother-in-law or other relative, but potentially also rented out to a stranger.

resembling or characteristic of an ape

(idiomatic) Vastly different.

An aphid.

(postpositive) In a generous or overlarge quantity.

Enough or more than enough.

(speech pathology) Affected by, or pertaining to, aphasia.