This is the 8651st most frequent Spanish word.
seal
The Spanish word "seal" translates to "foca," meaning a marine animal, or "sello," meaning a stamp or seal for marking.
Here, 'sello' refers to an official mark or stamp indicating authorization or validity.
El contrato debe llevar el sello oficial para ser válido.
The contract must bear the official stamp to be valid.
The word 'sello' here refers to a seal, specifically a stamp or adhesive used to close the letter.
El sello de la carta estaba bien adherido.
The seal on the letter was firmly attached.
In this sentence, 'foca' means seal as in the marine animal.