What's the difference between fecula and feculae?

Fecula

Definition:

• (n.) Any pulverulent matter obtained from plants by simply breaking down the texture, washing with water, and subsidence.
• (n.) The nutritious part of wheat; starch or farina; -- called also amylaceous fecula.
• (n.) The green matter of plants; chlorophyll.

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Feculae

Definition:

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