Decoding artificial lexicon: using agnoscrenia = poisonous spider, delanocrenia = poisonous snake, agnosdeery = brown spider, select the term for 'black widow spider' following noun+adjective formation

Given data

• agnoscrenia = poisonous spider ⇒ agnos = spider, crenia = poisonous.
• delanocrenia = poisonous snake ⇒ delano = snake, crenia = poisonous.
• agnosdeery = brown spider ⇒ deery = brown.
• Formation pattern: noun + adjective (e.g., spider+poisonous, spider+brown).

Concept/Approach (why this method)

Identify the consistent morphemes and preserve the observed ordering (noun followed by modifier). Unknown adjectives for 'black widow' must therefore follow the noun for spider.

Step-by-Step reasoning
1) The noun for spider is agnos.2) Options that respect noun+adjective order and contain agnos at the start are candidates.3) agnosvitriblunin fits the structure (spider + [descriptor]);4) trymuttiagnos reverses the order (adjective + spider) and so conflicts with the pattern.5) agnosdelano mixes spider and snake, which is semantically wrong; others do not fit known morphemes.

Verification/Alternative

Cross-check with given compounds: all use agnos first for spider, then color/quality. The selected option follows this exactly.

Common pitfalls

• Ignoring consistent word order in the artificial language.
• Choosing parts that encode a different animal (e.g., snake = delano).

Final Answer
agnosvitriblunin