Final answer:
The combining form lacrim(o) is closest in definition to tears.
Step-by-step explanation:
The combining form lacrim(o) is closest in definition to tears. The lacrimal fluid, which is produced by the lacrimal gland, drains at the medial corner of the eye into the nasolacrimal canal. This fluid then extends downward to open into the nasal cavity, behind the inferior nasal concha. With an increased flow of tears due to crying or eye irritation, some fluid can also drain anteriorly, causing a runny nose.