Pteryla is singular both plural and singular plural plural both plural and singular both plural and singular singular singular plural.
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How to say pterylae:
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1. What makes words plural?
2. What makes a word singular?
3. How to make acronyms plural.
purgative
Cyprian
comprobation
selfreliant
bifidities
hemoglobin
ophthalmoplegia
pterylae
leucophanite
semicontraction
A vs. An Quiz
An honor
or A honor?