"Spectrological" is a word in ENGLISH

Pertaining to Aaron, the first high priest of the Jews.

Pertaining to the surface or end opposite to the mouth in a radiate animal; -- opposed to actinal.

Of or pertaining to the abdomen; ventral; as, the abdominal regions, muscles, cavity.

Pertaining to, or formed by, the letters of the alphabet; alphabetic; hence, rudimentary.

Of or pertaining to the fir tree or its products; as, abietic acid, called also sylvic acid.

Of or pertaining to abietin; as, abietinic acid.

Of or pertaining to abiogenesis.

Pertaining to the study of inanimate things.

Pertaining to ablution.

Of or pertaining to aborigines; as, a Hindoo of aboriginal blood.

Pertaining to abortion; miscarrying; abortive.

Pertaining to Abraham, the patriarch; as, the Abrachamic covenant.

Pertaining to absence.

Of or pertaining to wormwood; absinthian.

Of or pertaining to absolutism; arbitrary; despotic; as, absolutist principles.

Pertaining to absolutism; absolutist.

Pertaining to abstraction.

Pertaining to, or resembling, an abyss; bottomless; unending; profound.

Of or pertaining to Abyssinia.

Of or pertaining to Acadie, or Nova Scotia.