The adverse environmental conditions in a building that pose a health risk to its occupants. / The symptoms experienced by people who work there.

The female or maternal branch of a family.

Alternative spelling of side effect

To alter as a side effect.

An unintended consequence of any action in addition to the intended consequence of that action.

(US) Of an egg: fried on one side, served with the unbroken relatively soft yolk on the top. / (of a newborn) Born with one's head facing upward, as opposed to the normal downward-facing birth.

(US) Of an egg: fried sunny side up.

(sports) A play in American football whereby the team performing the kick-off kicks the ball the minimum distance (ten yards in most levels of play) in an attempt to immediately regain possession of the ball.

(medicine, pathology) Any illness produced by ionizing radiation with symptoms ranging from nausea to death.

(transitive) To make ill. / (intransitive) To become ill. / (transitive) To fill with disgust or abhorrence. / (sports) To lower the standing of. / (intransitive) To be filled with disgust or abhorrence.