Of reasoning: based on something that is not true, or not based on solid reasons or facts. / Without a physical base.

A floor of a building below ground level. / (geology) A mass of igneous or metamorphic rock forming the foundation over which a platform of sedimentary rocks is laid.

(US) A simple, often damp, basement that has an earth floor.

A form of baseball, played in a gymnasium or similar venue, using a soft ball.

plural of baseboard

plural of baseball bat

A long instrument, typically wood, metal, or plastic, which is swung to strike baseballs.

A cap with a rounded crown and a curved, stiffened bill at the front.

(astronomy) A technique used to improve the angular resolution of a radio telescope by using multiple synchronized antennas very far apart.

A playing field on which the game of baseball is played.