An adjective “edible” = “able to be eaten”, a combination of Q. mat- “eat” with the suffix -ima “able” which induces lengthening of the base vowel: á (PE17/68; PE22/155).
Conceptual Development: The suffix -ima “able” dates all the way back to the Early Qenya of the 1910s, but the way it interacted with the verb evolved over time. In the Qenya Lexicon of the 1910s the form was ᴱQ. matsima (QL/59) with the usual Early Qenya sound change of ti to tsi (PE12/23). In the Quenya Verbal System of 1948 it was ᴹQ. mattima with consonant-doubling instead of vowel lengthening (PE22/111). In Common Eldarin: Verb Structure of the early 1950s it was Q. mastima with a variant suffix -tima and the usual sound change whereby t+t became st (PE22/137). The form mátima appeared in various notes from the 1960s (PE17/68; PE22/155).
mátima adj. "edible" (PE17:68), cf. mat-.