Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
incomma or encomma, ătis, n. [ἔγκομμα, an incision, mark; hence], the standard height of soldiers, Veg. Mil. 1, 5; Hier. in. Jovin. 2, 34; cf.: incomma mensura militum, Gloss. Isid.