Crossword clue: ecology scientist
4 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the outer defensive wall that surrounds the outer courtyard of a castle
a transparent piece of diamond that has been cut and polished and is valued as a precious gem
being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident l