The wels catfish (Silurus glanis)

Silurus glanis, a scaleless fresh-water catfish recognizable by its broad, flat head and wide mouth.

Whose arrival is a cause of joy; received with gladness; admitted willingly to the house, entertainment, or company. / Producing gladness. / Free to have or enjoy gratuitously.

Greeting given upon someone's arrival. / (nonstandard, especially Southern US) Ellipsis of you're welcome..

The act of greeting someone’s arrival, especially by saying "Welcome!"; reception. / The utterance of such a greeting. / Kind reception of a guest or newcomer. / The state of being a welcome guest.

To affirm or greet the arrival of someone, especially by saying "Welcome!". / To accept something willingly or gladly.

(manner) Accurately, competently, satisfactorily. / (manner) Completely, fully. / (degree) To a significant degree. / (degree, Britain, slang) Very (as a general-purpose intensifier).

In good health. / (hypercorrect) Good, content. / (archaic) Prudent; good; well-advised.

Used to acknowledge a statement or situation. / An exclamation of sarcastic surprise (often doubled or tripled and spoken in a lowering intonation). / An exclamation of indignance.

A hole sunk into the ground as a source of water, oil, natural gas or other fluids. / A place where a liquid such as water surfaces naturally; a spring.